TRAIL READY — BAY AREA & YOSEMITE
Offline day-hike essentials · Checked 8 September 2026

Emergency: call 911. This file does not call rescuers or locate you.
Tell rescuers: park/trail, coordinates, last junction, what happened, group size and battery.

LOST OR UNSURE OF THE TRAIL
Stop moving. Stay together. Calmly check the downloaded map, your position and last known junction. Don’t follow a stream or take a cross-country shortcut.

If you cannot confidently identify a safe route, stay put unless the spot is dangerous. Shelter, conserve battery and signal with a whistle. Seek help early if you cannot safely return; share coordinates and stay where rescuers expect you.


Source: US Forest Service · If you get lost — https://www.fs.usda.gov/visit/know-before-you-go/if-you-get-lost

OVERHEATING OR HEAT ILLNESS
Confusion, collapse, seizures or altered behaviour: call 911/SOS. Suspect heat stroke even if the person is sweating. Move to shade and cool immediately: wet the body/clothing, fan, and use cold wet cloths or ice packs at the neck, armpits and groin. Do not give fluids to someone confused or not fully alert.

For headache, nausea, dizziness or heavy sweating: stop, move to shade, loosen layers and cool down. If fully alert and able to swallow, sip cool water. Seek medical help; call 911 for worsening symptoms or any uncertainty about consciousness. Do not continue the hike.


Source: CDC · Heat-related illness — https://www.cdc.gov/niosh/heat-stress/about/illnesses.html

RATTLESNAKE BITE
Call 911/SOS immediately. Don’t wait for symptoms. Move away from the snake, keep the person calm and still, and remove rings or tight items before swelling. Keep the affected limb in a comfortable neutral position. Follow dispatcher instructions.

Do not chase the snake, cut or suck the wound, apply ice or a tourniquet. Minimise movement while arranging rescue.


Source: CDC · Venomous snakes — https://www.cdc.gov/niosh/outdoor-workers/about/venomous-snakes.html

SERIOUS INJURY OR HEAVY BLEEDING
Make the scene safe and call 911/SOS. Apply firm, continuous direct pressure to heavy bleeding using gauze or a clean cloth; use gloves if available. Follow the dispatcher’s instructions.

For life-threatening limb bleeding, use a commercial tourniquet if trained. Do not remove embedded objects. Keep the person warm and do not leave them alone.

If unresponsive and not breathing normally, follow dispatcher-guided CPR and use an AED if available. Don’t move someone with a suspected spine injury unless needed for immediate safety or lifesaving care.

American Red Cross · Severe bleeding ↗
Source: American Red Cross · Emergency care — https://www.redcross.org/take-a-class/resources/articles/the-three-cs-of-first-aid-check-call-care

NO RECEPTION: REACHING HELP
Try 911 first. If it cannot connect, a compatible iPhone may offer Emergency Text via Satellite. Follow the onscreen prompts outside with a clear sky and horizon, if safe. Trees and terrain can obstruct it.

Don’t climb hazardous ground searching for signal. Stay with the injured person and follow emergency instructions. Satellite access and rescue are not guaranteed; test the demo at home.


Source: Apple · Satellite SOS — https://support.apple.com/en-us/101573

TOO HURT OR EXHAUSTED TO WALK OUT
Stop somewhere safe and assess. Don’t pressure someone to keep going. Put on layers and protect them from sun, wind or cold ground.

If they cannot safely get back, seek help and share your location. Stay together if possible; don’t turn one injured hiker into a second lost person. Tell rescuers about changing symptoms or conditions.


Source: NPS · Hiking safety — https://www.nps.gov/articles/hiking-safety.htm

WATER & FUEL
Start with about ½ litre per hour per person for moderate conditions, then account for heat, effort and a reserve. For a four-hour outing, that is roughly 2 litres before extra needs. This is a packing baseline, not a drinking quota.

Hot exposed climbs can require more. If you cannot carry enough or confirm a safe refill, shorten or change the hike. Don’t rely on untreated stream water.

Snack regularly and bring familiar, substantial food for longer hikes. Avoid forcing excessive water.


Source: American Hiking Society · Water & essentials — https://americanhiking.org/10essentials/

WHEN TO TURN AROUND
Turn back before it becomes urgent. The planned turnaround time, dwindling water, worsening weather, a missed junction or a struggling companion are reasons to reassess immediately.

Use the slowest person’s pace. A fast time on another hike does not predict a hotter, steeper or longer route. Stop for pain or unusual fatigue; don’t make the summit the priority.

Check the actual park’s alerts and trailhead forecast before leaving. This site does not show live conditions.


Source: NPS · Hike Smart — https://www.nps.gov/articles/hiking-safety.htm

PHONES, WATCHES & OFFLINE MAPS
Keep offline maps on the phone being carried. A downloaded map does not provide cell service. Charge essential devices and keep a power bank accessible.

Set up emergency contacts and the phone’s medical-information feature. Some newer phones support satellite emergency messaging in eligible regions; check the manufacturer’s current instructions and practise with any available demo before the trip.

Do not assume a smartwatch can reach emergency services without a paired phone, network coverage or its own active cellular connection.


Source: Apple · Emergency SOS via satellite — https://support.apple.com/en-us/101573

WILDLIFE: GIVE IT ROOM
Rattlesnake: stop, back away and let it pass. Watch where you place hands and feet; never handle or corner it.

Mountain lion: stay together, face it, stand tall and slowly back away. Don’t run or crouch. If it attacks, fight back.

Yosemite black bear: give a bear in the wild at least 50 yards. Don’t approach or feed it. If it approaches you, stand together and shout loudly. Keep food attended and follow the park’s storage rules.

NPS · Yosemite bear encounters ↗
Source: CDFW · Mountain lions — https://wildlife.ca.gov/HWC/Mountain-Lions

TICKS & POISON OAK
Stay on the trail and avoid brushing through vegetation. After the hike, check skin and clothing for ticks.

Attached tick: grasp close to the skin with fine-tipped tweezers and pull steadily upward without twisting. Clean the area and hands. Don’t burn or smother the tick. Seek medical advice if fever or rash develops in the following days or weeks.

Poison oak contact: promptly wash exposed skin with soap and plenty of water; clean contaminated clothing and gear. Trouble breathing or a severe reaction needs urgent care.

CDC · Poisonous plants ↗
Source: CDC · Tick removal — https://www.cdc.gov/ticks/after-a-tick-bite/index.html

WATERFALLS, WEATHER & DELAYS
Stay back from slippery waterfall edges and fast water. Don’t cross a stream if depth or current makes the crossing uncertain.

Hear thunder? Seek a substantial building or enclosed hard-topped car. No outdoor spot is safe. Avoid ridges and isolated trees while heading to shelter. Wait at least 30 minutes after the last thunder before resuming.

If delayed into darkness, use your headlamp, stay together and avoid shortcuts. If you cannot navigate safely, stop in a safe place, put on layers, use your emergency blanket and seek help.

NPS · Water and terrain safety ↗
Source: National Weather Service · Lightning — https://www.weather.gov/safety/lightning-tips

BEFORE YOU GO
[ ] Water for everyone: Plan for duration, heat and a reserve; don’t assume a refill exists.
[ ] Food + extra snacks: Pack familiar, substantial food plus extra for delays.
[ ] Offline map tested: Open the whole route in airplane mode, including the way back.
[ ] Charged phone & backup power: Carry a small power bank and the right cable.
[ ] Headlamp: For an unexpected delay; check its battery even on a day hike.
[ ] First-aid & blister supplies: Bandages, gauze, tape, gloves, tweezers and personal medicines.
[ ] Sun protection: Sunscreen, sunglasses and a hat.
[ ] Extra layer & weather shell: Summits, wind and an unplanned stop can feel much colder.
[ ] Emergency blanket & whistle: Compact backup if you have to wait for help.
[ ] Small repair kit: Tape, a small multitool and safe fire-starting supplies; obey fire restrictions.
[ ] Conditions & route checked: Park alerts, trail weather, heat, smoke, daylight and closures.
[ ] Group & return plan agreed: Turnaround time, regroup points and someone at home informed.

Set a daylight turnaround time. Leave your route and return deadline with someone at home.
General reference, not a substitute for first-aid training. Live conditions and maps are not included.


VISUAL FIELD GUIDE — TEXT COMPANION
Photos are in the saved website; this text file has no images.

POISON OAK (Toxicodendron diversilobum)
Avoid contact
Recognise: Usually three leaflets, with the middle leaflet on a longer stalk. Edges vary from wavy to lobed; leaves may be glossy or dull. It can be a low shrub or climb into trees. Colour alone is not a reliable clue.
Where: Trail edges, oak woodland and shaded vegetation; also lower-elevation Sierra foothills. Do not assume brush beside a rest stop is harmless.
Do: Stay on the clear trail and keep bare legs and hands out of brush. If exposed, promptly wash skin with soap and plenty of water; clean clothing and gear that may carry the oil.
Recognise it across seasons: Spring growth can be green or reddish. Summer leaves are often green; autumn brings orange and red. Winter may leave bare stems, which can still expose you to urushiol. A leafless plant is not a safe handhold. Do not burn it. Seek medical care for a severe rash, and emergency help for breathing trouble.
Source: UC IPM · Identification & seasons — https://ipm.ucanr.edu/home-and-landscape/poison-oak/
Source: CDC · Exposure care — https://www.cdc.gov/niosh/outdoor-workers/about/poisonous-plants.html

NORTHERN PACIFIC RATTLESNAKE (Crotalus oreganus)
Give space
Recognise: A patterned, camouflaged snake; a visible rattle is a useful clue, but absence of rattling does not mean safety. Gopher snakes can look similar. Do not move closer to inspect the head, eyes or tail.
Where: Warm open trails, rocky ground and the edges of vegetation. On a climb, look ahead as well as at your footing; alert the people behind you if you see one.
Do: Stop, back away and let it leave. Keep the group well clear and do not poke, handle or try to move it. If the trail cannot be passed with plenty of space, wait or turn around.
If someone is bitten: Call 911 or use supported satellite SOS immediately. Keep them calm and minimise movement; remove rings or tight items before swelling. Follow dispatcher instructions. No cutting, suction, ice or tourniquet. Don’t try to catch the snake, and don’t wait for symptoms.
Source: East Bay Parks · Snakes — https://www.ebparks.org/safety/wildlife-encounters
Source: CDC · Snakebite response — https://www.cdc.gov/niosh/outdoor-workers/about/venomous-snakes.html

WESTERN BLACKLEGGED TICK (Ixodes pacificus)
Check after hiking
Recognise: Ticks are tiny, flat-bodied arachnids before feeding. Young stages can be much smaller than the adults in photos. This is one relevant California species, not a photo guide to every tick you might find.
Where: Grass, shrubs, leaf litter, logs and wooded areas—including oak and redwood forest. California ticks can occur year-round; spring and winter generally bring more activity.
Do: Avoid brushing through vegetation, consider protective clothing and an EPA-registered repellent used as labelled, and bring fine-tipped tweezers. Check during breaks and again after the hike.
A useful group routine: Hiking partners can help check hard-to-see areas: hairline, back, behind knees and under arms. Check beltline, groin, clothes and gear too. Remove an attached tick promptly: grasp close to skin, pull steadily upward, then clean the area. Don’t twist, burn or smother it. Seek medical advice for fever or rash after a bite.
Source: California Public Health · Tick prevention — https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/TickBorneDiseasePrevention.aspx
Source: CDC · Remove an attached tick — https://www.cdc.gov/ticks/after-a-tick-bite/index.html

BLACKBERRY: A USEFUL COMPARISON (Rubus species)
Learn the difference
Recognise: Blackberries have prickly canes and toothed leaflets. Native California blackberry often has three leaflets; Himalayan blackberry commonly has five, sometimes three. Poison oak lacks prickles, but don’t reach in to test it.
Where: Moist edges and creekside vegetation. Different plants can grow through one another, so identifying one blackberry cane does not identify everything around it.
Do: Compare the whole plant from the trail. When unsure, avoid contact. This guide is for recognition, not foraging; leave berries and plants for wildlife.
Compare the photos: Look for the stem as well as the leaves. Himalayan blackberry has stout, angled canes with broad curved prickles; California blackberry has rounder canes with finer prickles. Use the photo’s caption to see which species is pictured. Neither a berry nor a leaflet count alone is enough to make a nearby plant safe to touch.
Source: NPS · Blackberry identification and lookalikes — https://www.nps.gov/seki/learn/nature/nnp_plants.htm
Source: UC IPM · Poison oak characteristics — https://ipm.ucanr.edu/home-and-landscape/poison-oak/

MOUNTAIN LION (Puma concolor)
Rare encounter · know the response
Recognise: A large, generally tan cat with a long tail. A bobcat is smaller and has a short tail; avoid relying on apparent size from a distant photo alone.
Where: California wildlands, including wooded slopes and Yosemite. An animal may be present even when you never see it. Seeing one does not automatically mean an attack is imminent.
Do: Face it, stay upright and keep the group close. Make yourself look larger and slowly back away while leaving an escape route. Do not run, crouch or turn your back.
If it keeps approaching: Speak firmly and act assertively; do not bend down or advance for a photograph. If attacked, fight back. Report threatening behaviour to park staff; call 911 if there is immediate danger or injury. Daytime hiking is not a reason to skip knowing this response.
Source: CDFW · Mountain lion encounters — https://wildlife.ca.gov/HWC/Mountain-Lions

COYOTE (Canis latrans)
Observe from a distance
Recognise: Dog-like, with upright ears, a narrow muzzle and a bushy tail. Coat colour varies. Watch behaviour from a distance rather than approaching to identify it.
Where: Open country and the edges of woodland, including places close to cities. Coyotes are native and help control small-mammal populations.
Do: Give a distant coyote room and let it carry on. Keep food packed away; never feed it. If it approaches, stay together, back away slowly, make yourself big and make loud noise.
If it does not leave: Keep an exit available for the animal. Avoid approaching a den or pups. If contact occurs, fight back and seek help; report threatening behaviour. Don’t confuse a normal distant sighting with an emergency, but don’t reward a bold animal with food.
Source: CDFW · Coyotes and coexistence — https://wildlife.ca.gov/HWC/Coyotes

DEER (Mule deer & black-tailed deer)
Enjoy without approaching
Recognise: Long-legged browsers with large ears; males may carry antlers depending on season. The photo caption identifies the pictured deer. Don’t use antlers alone to decide what species or age you are seeing.
Where: Meadows and woodland edges. Yosemite Valley mule deer are a particularly familiar sight.
Do: Stop at a distance and let them cross. Keep away from fawns and give antlered males extra room. Never offer food or move closer for a selfie.
A good photo rule: Use a camera’s zoom from the trail. If an animal changes what it is doing because of nearby people, give it more space. Deer can injure people; NPS specifically warns that feeding and close approaches cause harm even with these apparently calm animals.
Source: NPS · Yosemite mammals and deer — https://www.nps.gov/yose/learn/nature/mammals.htm
Source: East Bay Parks · Wildlife encounters — https://www.ebparks.org/safety/wildlife-encounters

CATTLE ON THE TRAIL (Domestic grazing animals)
Pass calmly · give room
Recognise: Cows and calves may be resting near a gate, watering point or across the trail. Their presence can be part of conservation grazing, not escaped livestock.
Where: Some grazed open-space parks. Check the specific preserve’s information rather than assuming every trail has cattle.
Do: Slow down, let them see you and give the whole group a wide berth. Never walk between a cow and calf or cut through the middle of a herd. Do not pet, feed or chase them.
When the path is blocked: Wait for space or retreat if a safe pass isn’t possible. Don’t squeeze through a gate crowded with animals. Keep the group calm, close pedestrian gates as instructed by park signs, and never try to herd cattle out of the way.
Source: East Bay Parks · What to do around cattle — https://www.ebparks.org/natural-resources/grazing/safety
Source: East Bay Parks · Why parks are grazed — https://www.ebparks.org/natural-resources/grazing

YOSEMITE BLACK BEAR (Ursus americanus)
Keep at least 50 yards away
Recognise: Yosemite’s bears are black bears, including brown and cinnamon-coloured individuals. Do not infer “grizzly” from a brown coat.
Where: Yosemite forests, meadows and sometimes developed areas. This card is about Yosemite black bears; don’t apply it as a universal rule for other bear species or destinations.
Do: For a bear away from developed areas, stay at least 50 yards away—roughly half a football field. Do not surround it or approach cubs. If it approaches you, stand together and shout loudly to deter it. Do not run.
Food storage matters: Keep bars, trail mix and other scented items attended and follow Yosemite’s current storage instructions at parking areas and trailheads. Never feed a bear or surrender food to lure it away. If a black bear attacks, fight back; do not play dead.
Source: NPS · Yosemite bear encounters — https://www.nps.gov/yose/planyourvisit/scarebears.htm
Source: NPS · Bears and food storage — https://www.nps.gov/yose/planyourvisit/bears.htm

COAST LIVE OAK (Quercus agrifolia)
Worth recognising
Recognise: An evergreen oak with twisting branches and oblong leaves that often have toothed edges and a cupped upper surface. Look at the leaf arrangement and the whole tree, not only the outline of one leaf.
Where: California coastal plains, foothills and valleys. Several oak species can share a landscape; not every broad oak canopy is a coast live oak.
Do: Enjoy the canopy from the path. Before sitting beneath it, check the ground and surrounding brush for ticks and poison oak. A safe tree does not make all plants under it safe.
Oak vs poison oak: True oak leaves grow singly, while poison oak usually has three leaflets per leaf. Poison oak can also climb through other vegetation. Don’t assume a vine belongs to the tree supporting it. Photograph leaves without pulling branches down or leaving the trail.
Source: NPS · Coast live oak identification — https://home.nps.gov/pinn/learn/nature/treesandshrubs.htm
Source: UC IPM · True oaks vs poison oak — https://ipm.ucanr.edu/home-and-landscape/poison-oak/

COAST REDWOOD (Sequoia sempervirens)
Worth slowing down for
Recognise: Towering trunks with reddish, fibrous bark are a useful starting point. A redwood forest also contains other trees; a tall conifer by itself is not a complete identification.
Where: The moist coastal forest belt, including suitable Bay Area forest habitat. Fog and moisture are central to the environment these trees live in.
Do: Stay on established paths around roots. Enjoy fallen wood, ferns and the forest floor without climbing into fragile understory for a photo.
Not the same as a giant sequoia: Coast redwoods are the coastal species. Yosemite’s famous grove trees are giant sequoias. These related trees belong to different species and landscapes. Look for new shoots near redwood bases: redwoods can regenerate from roots and stumps, not just seeds.
Source: NPS · Coast redwoods — https://www.nps.gov/redw/learn/nature/about-the-trees.htm
Source: NPS · Yosemite plant communities — https://www.nps.gov/yose/learn/nature/plants.htm

CALIFORNIA POPPY (Eschscholzia californica)
Photograph, leave in place
Recognise: Orange to yellow, cup-shaped flowers with finely divided foliage. Use both flower and leaves; an orange flower alone is not enough to identify a plant.
Where: Sunny open ground. Flowering depends on season, weather and site—don’t expect a September hike to look like a spring wildflower photo.
Do: Photograph from the trail and leave flowers where they grow. Don’t step into a patch to make a portrait; that can crush plants that have not flowered yet.
Notice seasonal change: On a repeated route, compare the same patch over time: fresh foliage, flowering and dried seed heads can make a place look very different. These photos help with noticing plants; they are not an edible-plant guide.
Source: California State Parks · Poppy reserve & seasonal blooms — https://www.parks.ca.gov/?page_id=627

GIANT SEQUOIA (Sequoiadendron giganteum)
Yosemite grove highlight
Recognise: Massive trunks with thick reddish bark are the striking feature. Use grove signs to confirm individual trees; Yosemite’s forests contain many other large conifers.
Where: Yosemite’s Mariposa, Merced and Tuolumne groves. Don’t expect to see giant sequoias everywhere in the Valley or on every Glacier Point-area walk.
Do: Stay on designated paths and outside fenced root areas. Keep food secure here too: visiting trees does not remove the need for bear awareness.
A useful distinction to remember: Bay Area redwood forests and Yosemite sequoia groves are different plant communities. That change is part of what makes a Yosemite day hike interesting. Check a grove route’s distance, climbing and current access against the group’s ability and plan.
Source: NPS · Yosemite vegetation and groves — https://www.nps.gov/yose/learn/nature/plants.htm