When to Visit Glacier: Best Times, Weather, and Seasons

By Victoria Boissonade · Data: National Park Service · ← Complete guide Glacier

The quick answer: the ideal window runs from mid-June to mid-September, when the Going-to-the-Sun Road is fully open and temperatures are mild. To avoid the crowds without giving up the scenery, aim for September. The larches turn gold, elk enter the rut, and the lines virtually disappear.

Glacier National Park occupies the northwest corner of Montana, straddling the Continental Divide. That geography makes all the difference for the weather. Warm, moist air comes in from the Pacific on the west side, while cold, dry air arrives from the Arctic on the east. The two air masses collide along the ridgelines, making conditions downright unpredictable from one hour to the next. Be ready for anything: morning sunshine, hail in the early afternoon, and a blazing sunset.

Glacier's Climate Month by Month

The table below shows normal temperatures and precipitation in the valleys. At elevations above 6,600 feet, subtract 9 to 14°F in summer and expect snow even in July on the passes.

For real-time forecasts and hour-by-hour precipitation details, check the Glacier weather guide. It includes a widget updated daily and can help you avoid an unpleasant surprise on the pass.

Glacier Season by Season

Winter (December to February)

The mercury regularly drops below 5°F on north-facing slopes, and several feet of snow can accumulate at higher elevations. Nearly all secondary roads and most visitor centers close. The Going-to-the-Sun Road closes to motorized traffic in November, sometimes earlier.

What stays open includes the park entrances, which are open 24/7 year-round, snowshoe and cross-country ski trails around Apgar Village, and the low-elevation roads on both sides that standard vehicles can reach. Wildlife is easier to spot along the forest edge, including foxes, coyotes, and white-tailed deer. Visitation is almost nonexistent. If you're coming for deep snow and solitude, the park is striking in winter, but you'll need serious technical gear and must never head out alone on snow-covered trails.

Spring (March to May)

Snowmelt turns the trails into muddy streams from March through May. The park's lower areas, including the Lake McDonald area on the west side and St. Mary on the east, become walkable as early as April. High-elevation roads remain closed. The first flowers appear in the valleys in May. It's the quietest and most photogenic time for alpine botany enthusiasts.

Wildlife wakes up, and grizzly and black bears emerge from hibernation as early as April. Always keep at least 100 yards away from any bear, no exceptions, and carry bear spray as soon as you leave the parking lot. Moose frequent the wetlands around Many Glacier. Crowds remain light, but conditions change quickly, so bring backup plans.

Summer (June to August)

This is peak season. The Going-to-the-Sun Road starts opening in late May, but it rarely opens all the way before late June. In some years, lingering snow pushes the full opening past July 4. In July and August, every facility is operating, all 680 miles of trails are accessible, and valley temperatures reach 77 to 82°F on sunny days.

The tradeoff is heavy crowds. Logan Pass parking lots fill by 7 a.m., entrance lines grow long, and a timed-entry permit is required along the Going-to-the-Sun Road corridor. See the next section. July is statistically the driest month, but a hailstorm can sweep across the ridges within two hours. Always pack a waterproof layer, whatever the morning forecast says.

Summer wildlife is spectacular. Look for bighorn sheep on the walls around Logan Pass, plenty of marmots along the Highline Trail, and the occasional wolf if you scan the slopes at dawn with binoculars.

Fall (September to November)

September is our favorite. Daytime temperatures stay pleasantly mild at 50 to 68°F, larches and aspens turn gold and orange, and visitation drops 40 to 50 percent from July's peak. Elk enter the rut in the meadows around Many Glacier. When I visited in early September, I heard a bull bugling at dawn from the shore of Swiftcurrent Lake. Naturally, I stayed an extra hour.

The Going-to-the-Sun Road begins closing in stages in mid-October, and it can happen much earlier if snow arrives ahead of schedule. The ideal fall window runs from September 1 through 25. By November, full winter conditions have returned.

When to Avoid the Crowds at Glacier

Glacier ranks among the most visited national parks in the United States. Visitation follows a sharply defined bell curve.

Practical tip: in mid-July, Logan Pass, at 6,647 feet, is full before 8 a.m. Leave before 6 a.m. or after 5 p.m. to avoid the crush, and enjoy the much more interesting low-angle light for photography while you're at it.

Seasonal Reservations and Access

Glacier has introduced a timed-entry permit system for accessing the Going-to-the-Sun Road corridor during peak season. Exact dates vary from year to year. The complete process, Recreation.gov release windows, and vehicle size restrictions on the road are covered in the guide to getting to Glacier.

Here's what matters most. July time slots sell out within hours of release, often several months before the season starts. Plan early. If you're traveling without a permit, free-entry windows generally remain available very early in the morning and late in the day, but you'll need to reach the gate well before 6 a.m.

No permit is required in the off-season. Entry costs $35 per private vehicle, with a pass valid for 7 days, $20 per person on foot or by bicycle, and $30 for a motorcycle. The park-specific annual pass costs $70. The $80 America the Beautiful Pass covers all federal recreation sites and pays for itself on your second national park visit of the year.

The Best Time for Your Budget

Lodging prices in the gateway towns of Whitefish, Kalispell, and East Glacier track visitation with predictable regularity.

During peak season, in July and August, lodges and cabin rentals hit their peak rates. For in-park options, plan to book six to nine months ahead. During the shoulder season, in June and September, prices drop 20 to 35 percent from July levels while the park remains highly accessible. That's the best value available. In the off-season, from October through May, options become much more limited. Some lodges and restaurants close from mid-October through late May.

For flights from Europe, Denver, Seattle, and Calgary airports are the most common gateways. Transatlantic fares drop noticeably in September and October. The Glacier lodging guide covers the best options by season, budget, and area of the park.

The Best Time for Your Travel Style

• Wildlife and wildlife photography: April and May for bears emerging from hibernation, and September for the elk rut and low-angle fall light. The Glacier wildlife guide and Things to Do in Glacier list viewing spots and the best times to go.
• High-elevation hiking: mid-July through mid-August to access all the trails, including Highline Trail, Grinnell Glacier, and Iceberg Lake. Plan on a timed-entry permit and get up before sunrise. The Glacier hiking guide covers difficulty levels and logistics.
• Landscape photography: September, for golden light, glowing larches, and no heat haze, or June, for lingering snow on the ridges and glassy lakes at dawn.
• Families with kids: July, when all visitor centers and Junior Ranger programs are available. Book your lodging well in advance. The Glacier family guide offers kid-friendly itineraries.
• Keeping costs down: September, to combine lower rates with excellent conditions. Avoid July if you haven't booked six months ahead.

To plan your stops and set the right length for your trip, our Itinerary and Length Guide offers several two- to seven-day scenarios.

In Summary: The Best Time for Your Travel Style

Frequently Asked Questions