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), days average 56°F with 15.2 hours of daylight. Computed from NPS and NOAA data.

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 →

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).

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).

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.

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 2026-09-12