Glacier National Park in May: Weather, Trails & What to Expect

May is one of the best-kept secrets in Glacier National Park — you’ll have trails nearly to yourself, bears are actively foraging after hibernation, snowmelt-fed waterfalls roar at full volume, and cyclists claim Going-to-the-Sun Road before cars arrive. The trade-offs are real: most lodges inside the park stay closed until June, weather swings 30°F in a single day, and high-elevation trails remain buried in snow.

Entrance fees are $35 per vehicle per NPS.gov. No timed entry vehicle reservations are required in 2026 — the permit system was suspended this year, making May logistics simpler than recent summers.

Weather & Conditions in May

Glacier in May runs cold in the mornings and surprisingly warm by afternoon. Early May averages highs near 48°F and overnight lows around 29°F. By late May, afternoon highs climb to 67°F while nights still dip to 35°F. Any given day carries roughly a 38% chance of rain or snow per climate-data.org.

The defining challenge is the 30°F daily swing. A hike that starts frosty at 7 a.m. can end in shirtsleeves by noon — and turn back to sleet by 3 p.m. Layering isn’t optional; it’s the core strategy for staying comfortable all day.

Going-to-the-Sun Road in May

The 52-mile Going-to-the-Sun Road typically doesn’t open fully to vehicles until mid-June to early July, depending on plowing progress and snow depth. In May, park crews are actively clearing the road, but vehicle access is restricted past certain points on both sides.

For cyclists, this creates an unrivaled window. Once plowed sections are clear of snow, cyclists can ride the open stretch with zero car traffic, zero noise, and spring scenery that summer visitors never see. This is widely considered the best biking window in Glacier‘s entire year.

Lower road sections open to vehicles earlier in May. The west side (West Glacier to Lake McDonald Lodge) and east side (St. Mary to Rising Sun) typically allow vehicles in May. The upper Logan Pass section remains closed to all traffic until plowing is complete per NPS.gov.

Best Hikes Open in May

Most high-elevation trails remain buried under several feet of snow in May. Stick to lower-elevation routes where snowmelt-fed waterfalls are at maximum flow and the park feels freshly alive. These three trails are reliably accessible and consistently rewarding in May.

Avalanche Lake is the most rewarding May hike. The Trail of the Cedars section through old-growth cedar forest is lush from runoff, and the lake sits beneath dramatic cliffs with multiple waterfalls visible from the shoreline. Start before 8 a.m. to have it nearly to yourself even in late May.

Apikuni Falls (Many Glacier area) is a short but steep 1.7-mile round trip rewarded with a falls at full snowmelt force. The trail stays at lower elevation and typically opens before mid-May. Note that the Many Glacier area may have construction access restrictions through mid-May 2026 — confirm via NPS.gov before driving out.

Microspikes are worth packing even for lower trails — shaded sections can hold patchy ice through late May. Mud from snowmelt is the other constant: waterproof boots aren’t optional.

Wildlife Viewing in May

May is one of the highest-probability months for wildlife sightings in Glacier. Bears emerge from hibernation and forage actively at lower elevations. Cubs are newly born and visible alongside mothers. Ungulates — moose, elk, deer — are calving, meaning young animals appear in meadows. Fewer visitors mean less human disturbance and more natural animal behavior across the park.

The single best wildlife strategy: drive Camas Road at sunrise or sunset. This road crosses prime bear and deer habitat, and in May you’ll often cover it with almost no other vehicles. Pull over at wide spots and scan open meadows with binoculars before moving on. Early May morning drives along the lower open sections of Going-to-the-Sun Road — particularly between the Apgar area and Lake McDonald Lodge — also regularly produce bear sightings. Keep speed low and eyes on open slopes above the treeline.

What’s Open in May

May is a transitional month. Some facilities open mid-month; most full-service amenities wait until June. Plan around this gap rather than hoping for things to be open that aren’t.

The practical implication: bring your own food. Dining options inside the park are almost nonexistent in May. Stock up in Whitefish (30 minutes from the west entrance), Columbia Falls, or St. Mary before driving in. For overnight stays, West Glacier area lodging and Whitefish are the most reliable options.

For campground reservations, use Recreation.gov. Demand in May is far lower than summer, but popular campgrounds like Sprague Creek can still fill on holiday weekends. Glacier Park Boats launches Lake McDonald cruises around mid-May — a ranger-narrated cruise that’s an excellent alternative when trail conditions are uncertain.

Wildflowers in May

May wildflowers in Glacier are early bloomers at low elevations — emerald meadows fresh from snowmelt, vivid and uncrowded. Peak wildflower season runs July–August at high elevations, but May delivers its own payoff: the saturated green of spring that crowded summer months never quite replicate.

Beargrass — Glacier’s most iconic wildflower, with its tall white plume — begins emerging in late May at lower to mid elevations. For a detailed breakdown of bloom timing by elevation, see where and when to see wildflowers in Glacier National Park.

The Trail of the Cedars near Avalanche Creek and the lower sections of the Many Glacier valley are the best May wildflower targets. Both are accessible by early May and offer dense spring vegetation with reliable parking before summer crowds arrive.

What to Pack for May

Packing for Glacier in May means planning for sunshine, rain, sleet, and cold — potentially all in one hiking day. The layering system is non-negotiable. Cotton retains moisture and kills body heat in wet conditions; use synthetic or merino wool throughout.

For a complete breakdown of what rangers and repeat visitors recommend, see our 15 Glacier National Park tips and mistakes to avoid.