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.
Planning Glacier? Pack a guidebook: Moon Glacier National Park on Amazon. · affiliate link, VisitWhen earns from qualifying purchases
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).
Affiliate links: VisitWhen earns from qualifying purchases, at no extra cost to you. Prices can change; Amazon shows the current one.
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.
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)
As an Amazon Associate, VisitWhen earns from qualifying purchases. Gear names above link to Amazon searches or to a specific product — we don't show or set prices; you always see Amazon's current price.
Packing for a trip with a date on it? Amazon Prime includes fast delivery on eligible items, and eligible new members may be offered a free trial, so gear ordered this week can arrive before you leave. Delivery speed varies by item and address. See if you can try Prime free →
Affiliate link — we may earn a commission on qualifying sign-ups, at no extra cost to you. Current terms are on Amazon's page.
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 2026-09-24