Trip details · Alkali Flat Trail

Alkali Flat Trail packing checklist

ActivityDay hike
ParkWhite Sands National Park, NM
NearestMather Campground, 401 mi

A strenuous 5-mile out-and-back over steep gypsum dunes to the edge of the Alkali Flat, the dry bed of ice-age Lake Otero. There is no shade, no water and no trail you can see, only red marker posts, so heat, wind and getting lost are the real risks.

Trip details

Distance: 5 mi round trip (2.5 mi each way)
Elevation gain: Repeated climbs over dunes about 60 ft high
Difficulty: Strenuous · about 3 hours
Trailhead: Alkali Flat Trail parking area near the end of Dunes Drive, 7 mi from the visitor center
Trail markers: Red posts with a diamond symbol
Pets: Allowed on a leash of 6 ft or less
Best season: Fall through early spring, starting in the morning (our pick)

Source

"Our pick" seasons are our own call.

Packing list

Ready to go: 0% · you have 0 of 16

Before you go

Check conditions and test closures. Look at NPS White Sands: current conditions and NPS White Sands: military testing closures the day before and the morning you go. As of Oct 20, 2026, Dunes Drive is open with a no-stopping safety corridor from mile 3 to 5.5, and backcountry camping and the Interdune Boardwalk are closed.
Plan your hours and pass. Gates open at 7 a.m. and the park closes 30 minutes after sunset; it is closed Thanksgiving and Christmas Day. Entry is $25 per vehicle for 7 days, and NPS suggests buying or downloading your pass before you arrive because signal is limited. Oct 27, 2026 is a fee-free day. NPS: hours · NPS: fees
Tell someone your plan. NPS recommends not hiking alone. Tell someone who isn’t with you where you’re going and when you’ll be back. NPS: leave a trip plan
Know when to turn back. Turn back if you can’t see the next marker, when half your water is gone, if it is 85°F or hotter, or if the light is fading before sunset.

This list is a starting point, not a guarantee. Conditions change, so adjust it for your trip and your group.

We earn from qualifying Amazon purchases. Details

Check off what you already have. For anything you still need, there’s a product suggestion when we have a good match.

Trip-specific: permits and hazards

Check for missile-test closuresWhite Sands Missile Range surrounds the park. During tests, Dunes Drive, the only road to this trailhead, can close to all traffic for up to 3 hours, sometimes with only 24 hours’ notice. US 70 toward Las Cruces can close too; call (575) 678-1178 for highway updates. Check the closures page the day before.
No product pick yet. Bring your own or check with the park.
Source: NPS White Sands: military testing closures
Heat: don’t start at 85°F or aboveNPS recommends not starting this hike if it is 85°F (30°C) or warmer. There is no shade and no water on the trail, and heat illness can be fatal. Start in the morning, rest and drink when tired, and turn around when your water is half gone.
No product pick yet. Bring your own or check with the park.
Source: NPS White Sands: Alkali Flat Trail
Wind, blowing sand and getting lostThere is no worn path. Follow the red posts with a diamond symbol, and look for the next one before you move on. If wind knocks a post down or blowing sand hides the next one, NPS says do not go on: return to your car. Spring winds are the worst, but gusts can happen any time.
BUFF Original EcoStretch Neck Gaiter
$23.00 on Amazon
Pull it over your nose and mouth when wind lifts the sand; it is also UPF 50 sun cover for your neck.
Buy on Amazon (opens in new tab)
Source: NPS White Sands: Alkali Flat Trail
Reflected sun off white sandThe white gypsum reflects sunlight, so you burn from below as well as above. NPS advises sunscreen, sunglasses, and a hat, long sleeves and pants even in summer.
Banana Boat Sport SPF 50 Spray (2-pack)
$11.49 on Amazon
White sand reflects the sun back up at you, so reapply often, including under your chin and nose.
Buy on Amazon (opens in new tab)
Source: NPS White Sands: Alkali Flat Trail
Don’t touch strange objectsDebris from missile tests sometimes lands in the park and gets buried by sand. If you see anything odd, do not touch it. Note where it is and tell a ranger.
No product pick yet. Bring your own or check with the park.
Source: NPS White Sands: Alkali Flat Trail
Safety corridor and closures on Dunes DriveYou can drive through miles 3 to 5.5 of Dunes Drive, but you may not stop, park or get out there, and the dunes south of the road in that stretch are closed to all foot traffic. The Interdune Boardwalk and all backcountry camping are closed, so this is a day hike only.
No product pick yet. Bring your own or check with the park.
Source: NPS White Sands: safety corridor in effect
If you bring a dogPets are allowed on a leash no longer than 6 feet and under physical control. Hot sand and no water are hard on dogs too, so bring water for them and skip warm days.
Ruffwear Quencher Collapsible Dog Bowl
$24.99 on Amazon
There is no water in the dunes for your dog either. Pack extra and offer it often.
Buy on Amazon (opens in new tab)
Source: NPS White Sands: Alkali Flat Trail

The Ten Essentials (NPS)

WaterNPS asks for at least two 1-liter bottles per person on every trail, and double for longer hikes. This is the park’s longest marked trail, so plan on about 4 liters (1 gallon) per person, and fill up at the visitor center first. There is no water in the dunes.
Nalgene Tritan Wide Mouth 32 oz
$17.80 on Amazon
NPS: at least two 1-liter bottles per person on every trail, double for longer hikes. Bring several.
Buy on Amazon (opens in new tab)
Source: NPS White Sands: Alkali Flat Trail
Food and extra foodNPS suggests high-energy snacks such as fruit and nuts. Eat when you rest; the dune climbs burn more than the mileage suggests.
No product pick yet. Bring your own or check with the park.
Navigation: offline map, map and compassDownload an offline map and mark the trailhead before you go, since cell signal is limited. NPS suggests a fully charged phone kept in airplane mode to save battery. Still, if you cannot see the next marker, turn back.
Suunto A-10 Compass
$24.00 on Amazon
A backup for finding your way back to the trailhead if the marker posts disappear in blowing sand.
Buy on Amazon (opens in new tab)
HeadlampPlan to be off the trail by sunset. The park closes 30 minutes after sunset. Your phone isn’t a headlamp.
Petzl Tikka Headlamp
$34.95 on Amazon
Be off the trail by sunset, but carry a light in case a slow return runs into dusk.
Buy on Amazon (opens in new tab)
Source: NPS White Sands: operating hours
Sun protectionNo shade on the whole route. Wear a wide-brim hat and sunglasses along with sunscreen.
Sunday Afternoons Adventure Hat (UPF 50+)
$54.00 on Amazon
No shade anywhere on this trail. A wide brim and neck cape cover what a cap misses.
Buy on Amazon (opens in new tab)
Source: NPS White Sands: Alkali Flat Trail
Insulation and wind layerNPS calls fall mild, but temperatures drop quickly once the sun is low, and the wind can make it feel colder.
Columbia Men’s Steens Mountain 2.0 Fleece
$45.50 on Amazon
Fall days are mild, but the basin cools fast near sunset and the wind adds a chill.
Buy on Amazon (opens in new tab)
First aid kitFor blisters, scrapes and sprains, the most common trail problems.
Adventure Medical Kits Ultralight/Watertight .5
$31.95 on Amazon
For blisters from sand in your shoes, scrapes and sprains on steep dune faces.
Buy on Amazon (opens in new tab)
Fire starter and emergency shelterIf you get lost or hurt, an emergency bivvy keeps you warm while you wait. Carry a lighter for emergencies only.
SOL 90% Emergency Bivvy
$25.49 on Amazon
If you get lost or hurt and have to wait for help, it holds in body heat on a cold desert night.
Buy on Amazon (opens in new tab)
Knife or repair kitFor quick gear fixes, cutting tape or trimming a blister pad.
Opinel No. 08 Stainless Folding Knife
$16.80 on Amazon
For quick gear fixes, cutting tape or trimming a blister pad.
Buy on Amazon (opens in new tab)

Prices and stock checked on Amazon on Oct 20, 2026, and may have changed.

Photos

Hikers crossing bright white gypsum dunes on the Alkali Flat Trail, with mountains on the horizon — Photo: Footwarrior (cropped) · CC BY-SA 3.0 · Wikimedia Commons

A hiker walking along a White Sands dune ridge at dusk — Photo: Matt Le · CC0 · Wikimedia Commons