Glacier in May: Crowds, Weather & What to Pack

Shoulder · VisitWhen score 63/100 · #6 of 12 months

May is a solid shoulder-season month to visit Glacier National Park: crowds run 27% of the July peak (202,281 average visits). Weather: highs average 56°F and lows 35°F, with 2.8″ of precipitation and 15.2 hours of daylight. Headline access is typically closed this month — see the access warning below. Computed from NPS and NOAA data.

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Bring for Glacier in May

Warm mid-layer (fleece or light puffy)See it on AmazonWhy: mornings average 35°F.
Packable rain jacketSee it on AmazonWhy: 2.8″ of precipitation is normal this month.
Bear spraySee it on AmazonWhy: recommended by the park in grizzly country (check current park regulations before you carry).

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Access warning: Going-to-the-Sun Road's alpine section typically opens fully late June–early July and closes in mid-October; lower valleys stay accessible year-round. That typically affects May — verify before planning. Current NPS conditions →

Glacier in May: what the park service says

May at Glacier comes before the summer season, which the park service says generally runs from late May through September. Most services in and near the park do not reopen until late May or early June, so plan to be self-sufficient. By late May most roads are open to cars, but Going-to-the-Sun Road over Logan Pass usually does not open fully until late June or early July; while it is being plowed, parts are often open to hikers and cyclists only. Higher trails can stay snow-covered and dangerous until late June, and bears are very active in spring, so carry bear spray.

Source: NPS 1, NPS 2, checked 2026-11-07.

The sun sets atop a ridge of mountains; a stream glistens in the mountain valley below. — Glacier National Park — photo: NPS Photo (public-domain NPS media)

Crowds in May

Glacier averages 202,281 recreation visits in May — 27% of what July, the peak month, draws. That crowd level sets the tone for parking, permits and lodging.

Average visits (May)

202,281 (mean 2021–2025, NPS)

Share of the year

6.6% of annual visitation

vs. peak (July)

27%

Weather & daylight

Daytime stays cool (highs average 56°F), and mornings are chilly (lows average 35°F). Average precipitation is 2.8″ for the month. Mid-month daylight runs 15.2 hours.

NOAA 1991–2020 monthly normals, station ST. MARY 1 SSW, MT US (17 mi from park coordinates, 4,555 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of May.

What to pack for Glacier in May

Computed from the month's weather normals above — not a generic list.

Warm mid-layer (fleece or light puffy) — mornings average 35°F
Packable rain jacket — 2.8″ of precipitation is normal this month
Sturdy broken-in footwear, navigation and a basic first-aid kit — every park, every month
Bear spray — recommended by the park in grizzly country (check current park regulations before you carry)

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Want quieter or kinder conditions? The computed best months for Glacier are June and September.

Also at their best in May

Other parks whose computed May verdict is a best window — same NPS × NOAA formula:

Lake Clark in May — 7% of peak crowds, highs 59°F, score 96/100
North Cascades in May — 11% of peak crowds, highs 69°F, score 96/100
Katmai in May — 1% of peak crowds, highs 52°F, score 95/100
Gates of the Arctic in May — 12% of peak crowds, highs 56°F, score 94/100

Common questions

Is Glacier crowded in May?

No — May is one of the quieter months: 27% of the July peak, averaging 202,281 visits (NPS, 2021–2025). See every month at Glacier.

What is the weather like in Glacier in May?

Average highs of 56°F, lows of 35°F, 2.8″ of precipitation (NOAA 1991–2020 normals, ST. MARY 1 SSW, MT US station). Compare it with other national parks in May.

What should I pack for Glacier in May?

Warm mid-layer (fleece or light puffy); Packable rain jacket; Sturdy broken-in footwear, navigation and a basic first-aid kit — the full weather-computed list is on this page. Going in June instead? Glacier in June has its own list.

Is everything open at Glacier in May?

Going-to-the-Sun Road's alpine section typically opens fully late June–early July and closes in mid-October; lower valleys stay accessible year-round. Always check the park's live NPS alerts for current conditions.

See also: the best national parks to visit in May · Last verified 2026-09-24