Year-round Weather in Glacier National Park

The weather in Glacier National Park ranges from summer highs in the 90s to the negative digits in the winter. Even in the ideal summer weather window, temperatures and conditions vary widely and change rapidly here in our neck of the woods.

So how can you be prepared for the weather on your next trip to Glacier? In this guide, I'll share my local perspective on the weather patterns you can expect month-by-month in Glacier. You'll also get recommendations to help you enjoy Glacier National Park with rain, shine, or in the snow in the forecast. As Alfred Wainwright once said, “There’s no such thing as bad weather, only unsuitable clothing.”

January & February: Cold, Snowy, and Quiet

January and February are the coldest months in Glacier National Park, with average highs around 31–36°F and lows that can dip below zero. Snowfall is frequent, and the park takes on a different character entirely — hushed, white, and largely empty of crowds.

The Going-to-the-Sun Road (GTSR) is closed to vehicles beyond Lake McDonald Lodge at the west entrance and St. Mary at the east entrance. If you’re visiting in winter, access is on foot, skis, or snowshoes only.

What to expect:

• Deep snow at higher elevations, icy roads at lower ones
• Wildlife is more visible in open meadows (wolves, elk, bison near St. Mary)
• Lake McDonald can freeze and is beautiful for winter photography
• Very few services open inside the park

What to wear: Base layers, insulated mid-layers, waterproof outer shell, warm boots rated to -20°F, hand warmers. Don’t underestimate wind chill near ridgelines.

March: Late Winter, Slowly Warming

March averages highs around 44°F, but don’t let that fool you — it can still snow heavily and temperatures drop sharply after sunset. The GTSR remains closed and snowpack at upper elevations is at or near its peak.

That said, March is a fantastic time for snowshoeing and cross-country skiing near Apgar and Polebridge. The light starts to get longer and golden-hour photography around the park’s lower elevations is stunning this time of year.

What to expect:

• Variable conditions — warm afternoons, cold nights, and surprise snowstorms
• Avalanche risk is elevated in backcountry areas
• Bears begin emerging from dens by late March
• Fewer than 1% of annual visitors come in March

What to wear: Same winter kit as Jan/Feb, but waterproof layers become more important as snow starts to get wetter and heavier.

April: Shoulder Season Begins

April is when Glacier starts to wake up. Highs climb to the low-to-mid 50s, snowmelt begins in earnest at lower elevations, and a few facilities start reopening. Wildflowers can appear near the lake-level trails by late April.

The GTSR is still closed to vehicles, but the stretch from Apgar to the Avalanche Creek trailhead typically opens to bicycles in April (before cars). This “bike the sun road” window is a beloved local tradition.

What to expect:

• Muddy trails at lower elevations, deep snow at upper elevations
• Waterfalls are at their most dramatic as snowmelt peaks
• Wildfire smoke is not a concern at this time of year
• Hotel rates are still low

What to wear: Waterproof hiking boots, rain jacket, mid-layer fleece. Temperatures can swing 30+ degrees from morning to afternoon.

May: The Park Starts Humming

May is one of my favorite months in Glacier. The park is lively but not yet crowded, wildflowers are starting to pop at lower elevations, and the days are long. Average highs climb to the low 60s.

The big event in May: the Going-to-the-Sun Road opens. The NPS typically opens the full GTSR to vehicles sometime in late May, depending on snowpack and plowing progress. In recent years, full vehicle access has come anywhere from May 20 to early June. Check the NPS road status page before your trip.

What to expect:

• GTSR opens late May (confirm dates with NPS)
• Logan Pass is still snowpacked — bring microspikes if hiking there
• Bears are active and visible (especially grizzlies along the east side)
• Crowds are manageable; no vehicle reservation system yet in May

What to wear: Layered system. Mornings and evenings are cold (30s–40s), afternoons can reach the 60s. Rain jacket and waterproof boots are essential.

June: Beautiful, But Expect Rain

June averages highs in the low 70s, and the park is stunning — snowfields still cling to the high peaks, wildflowers are exploding at mid-elevations, and the waterfalls are running hard from snowmelt. It’s easily one of the most visually spectacular months to visit.

The tradeoff: June is Glacier’s rainiest month. You will get rained on. Plan for it and embrace it — post-rain light is some of the best for photography.

What to expect:

• Frequent afternoon thunderstorms, especially on the east side
• GTSR open, but Logan Pass can still have snow and ice on the trail shoulders
• Vehicle reservation system may be in effect for GTSR — check NPS site
• Some campsites and facilities may still be opening

What to wear: Waterproof everything. Rain jacket, waterproof hiking boots, quick-dry layers. Microspikes can still come in handy near Logan Pass early in the month.

July: Peak Season, Peak Weather

July is the most popular month to visit Glacier, and for good reason. Average highs reach the low 80s, skies are mostly clear, and virtually every trail in the park is accessible. The GTSR is fully open, all facilities are running, and the park is at full energy.

The flip side: it’s also the most crowded month. The vehicle reservation system for the GTSR is almost always in effect. If you’re driving up to Logan Pass before 6 AM or after 3 PM, you’ll often avoid the need for a ticket (check the current NPS guidelines).

What to expect:

• Warm, sunny days with occasional afternoon thunderstorms
• High wildflower season at upper elevations (Highline Trail, Logan Pass meadows)
• Book accommodations 6–12 months in advance
• Smoke from wildfires can begin in late July in dry years

What to wear: T-shirt and hiking pants are fine for midday, but always bring a rain layer and a mid-layer fleece. Temperatures at Logan Pass (6,600 ft) are 15–20°F colder than at the lake level.

August: Still Great, Watch for Smoke

August is nearly identical to July in temperature (highs around 81°F) but comes with a caveat: wildfire smoke. In dry years, smoke can roll into the Flathead Valley and reduce visibility significantly — sometimes for days at a time. In good years, August is as clear and beautiful as July.

The crowds are still present but very slightly less intense than the peak of July. Wildflowers at high elevation are winding down, but late-season huckleberries are starting to ripen (which means bears are active in berry patches).

What to expect:

• Smoke risk: check AirNow.gov and PurpleAir before your trip
• Huckleberry season — great for foraging, means increased bear activity
• Most trails are snow-free, including late-melting routes
• Water sources can be low in dry years — carry more than you think you need

What to wear: Similar to July. Add an N95 mask to your kit in case smoke is heavy.

September: Arguably the Best Month

I’ll say it plainly: September might be the best month to visit Glacier. Crowds drop dramatically after Labor Day, the smoke from August usually clears, and the larches turn gold in late September for one of the most spectacular fall color displays in the American West.

Highs are in the upper 60s, nights are crisp (upper 30s to low 40s), and the light has that beautiful low-angle quality that photographers dream about. Trails are in great shape, wildlife is active, and you can often walk up to Logan Pass without a reservation.

What to expect:

• GTSR closes after Labor Day weekend (first week of September) — check NPS for exact dates
• Larch trees turn gold mid-to-late September (Larch Valley, Ptarmigan Tunnel area)
• Grizzly bears are hyperactive in berry and whitebark pine areas (hyperphagia)
• First snowfall at high elevations can come in late September

What to wear: Layered system becomes essential again. Cold mornings, mild afternoons, cold evenings. Always carry a hat and gloves in September.

October: Solitude and Early Snow

October is for serious nature lovers who don’t mind the cold. Highs drop to the mid-50s, and the first significant snowstorms of the season often arrive mid-month. The larch color lingers into early October, and the park has a haunting, beautiful emptiness to it.

Most facilities inside the park close by mid-October. The GTSR closes to vehicles in October, though exact dates vary by year.

What to expect:

• Rapidly changing weather — snow can arrive any day after October 1
• Most campgrounds and lodges closed
• Outstanding wildlife viewing (elk rut, waterfowl migration)
• Trails may be icy above 4,000 ft

What to wear: Full winter kit. Treat October like late March in terms of layering.

November & December: Winter Returns

By November, Glacier is firmly in winter mode. Average highs drop to the upper 30s in November and the low 30s in December. Snowfall is consistent, the GTSR is closed, and the park is quiet.

This is the time for cross-country skiing, snowshoeing, and winter wildlife watching. The towns of Whitefish and Kalispell stay active year-round and make a good base for winter visits.

What to expect:

• Heavy snowfall at all elevations
• Road closures throughout the park beyond main corridors
• Exceptional stargazing (park is an International Dark Sky Park)
• Holiday markets in Whitefish in December

What to wear: Full winter gear. Think ski resort level of insulation.

What to Wear in Glacier: Month-by-Month Packing List

Packing for Glacier is less about picking one set of clothes and more about building a layered system that works across wildly different conditions. Here’s how I think about it by season:

Winter (Nov–Mar): Thermal base layers (wool or synthetic), insulated mid-layer, waterproof shell jacket and pants, warm hat, balaclava, insulated gloves, waterproof boots rated to -20°F, microspikes or snowshoes.

Spring (Apr–May): Moisture-wicking base layer, fleece mid-layer, waterproof rain jacket, waterproof hiking boots, convertible pants, wool or synthetic hat, light gloves, microspikes for higher trails.

Summer (Jun–Aug): Light moisture-wicking shirt, hiking pants or shorts, waterproof rain jacket (non-negotiable even in July), fleece or puffy for Logan Pass and evening, sturdy waterproof hiking boots, sun hat, sunscreen SPF 50+, sunglasses. N95 in pack for August smoke.

Fall (Sep–Oct): Layered system similar to spring but plan for faster deterioration. Down or synthetic puffy jacket, waterproof shell, warm hat and gloves, gaiters for trails with snow or mud.

Glacier Weather FAQs

What is the best month to visit Glacier National Park?

July and August offer the best weather for hiking all trails, with warm temps and full GTSR access. September is the best-kept secret — fewer crowds, larch color, and still excellent conditions. It really depends on what you want from your trip.

Does it snow in Glacier in July?

Snowfall at the valley floor in July is extremely rare, but it’s not unheard of at Logan Pass (6,600 ft). Overnight lows at altitude can approach freezing even in mid-summer. Always carry a layer.

How cold does it get at Logan Pass?

Logan Pass sits at 6,646 feet and is typically 15–20°F colder than at Lake McDonald or St. Mary. In July, when it’s 80°F at the lake level, expect 60–65°F at Logan Pass — and wind makes it feel colder. In September, expect highs in the 40s and lows near or below freezing.

When does the Going-to-the-Sun Road open?

The GTSR typically opens to vehicles in late May or early June, depending on snowpack and NPS plowing progress. The NPS publishes regular updates at nps.gov/glac. Bicycle access (from Apgar to Avalanche Creek) often opens in April before vehicles.

Is wildfire smoke a problem in Glacier?

It can be, primarily in August and occasionally in late July and early September. Smoke levels vary significantly year to year. Check AirNow.gov and PurpleAir in the days before your trip. Some years are nearly smoke-free; others see multiple weeks of hazy skies.

What are the rainiest months in Glacier?

June is the rainiest month, with frequent afternoon thunderstorms. May and October also see significant precipitation. July and August are the driest months, though afternoon thunderstorms can pop up quickly — especially on the east side of the park.

Can I visit Glacier in winter?

Yes, and it’s worth considering if you’re looking for solitude and a completely different experience. Lake McDonald in winter is stunning. Snowshoeing and cross-country skiing are the main activities. Most park facilities are closed, so plan ahead and base in Whitefish or Kalispell.

Planning Your Visit Around Glacier Weather

The honest answer to “when should I go?” is: it depends on your priorities.

• Best hiking access: July–August (all trails open, full GTSR, warm temps)
• Fewest crowds: September (post-Labor Day) or May (pre-crowds)
• Best fall color: Late September (larch trees gold, first snow possible)
• Budget travel: Shoulder months (April–May, October) for lower hotel rates
• Wildlife watching: May–June for new calves and active predators; September for hyperphagia bears
• Winter experience: January–March for snowshoeing, skiing, and frozen lake photography

Whatever month you choose, the key to enjoying Glacier is flexible expectations and the right gear. Weather here changes fast. The best visitors we see on our tours are the ones who came prepared for anything and ended up loving every minute of it.

If you’re planning a trip and want help figuring out what to do given your travel dates, browse our Glacier tours — we run trips from May through September and our guides know this park inside and out.