North Cascades in May: Crowds, Weather & What to Pack

Best window · VisitWhen score 96/100 · #1 of 12 months

May is one of the best months of the year to visit North Cascades National Park: crowds run 11% of the July peak (1,030 average visits). Weather: highs average 69°F and lows 44°F, with 1.1″ of precipitation and 15.2 hours of daylight. Roads and services are only partly open this month — see the access note below. Computed from NPS and NOAA data.

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Partial access: State Route 20 (the North Cascades Highway) typically closes November–late spring due to avalanche danger. Current NPS conditions →

boats on the water with mountains and trees surrounding — North Cascades National Park — photo: NPS Photo/D.Dixon (public-domain NPS media)

Crowds in May

North Cascades averages 1,030 recreation visits in May — 11% of what July, the peak month, draws. Trailheads and parking fill accordingly — crowds are thin by this park's standards.

Average visits (May)

1,030 (mean 2021–2025, NPS)

Share of the year

3.4% of annual visitation

vs. peak (July)

11%

Weather & daylight

Days are mild (highs average 69°F), and mornings are chilly (lows average 44°F). It is typically dry (1.1″ of precipitation). Mid-month daylight runs 15.2 hours.

NOAA 1991–2020 monthly normals, station STEHEKIN 4 NW, WA US (12 mi from park coordinates, 1,257 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of May.

What to pack for North Cascades in May

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

Warm mid-layer (fleece or light puffy) — mornings average 44°F
Sturdy broken-in footwear, navigation and a basic first-aid kit — every park, every month

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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
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
Wrangell–St. Elias in May — 18% of peak crowds, highs 62°F, score 94/100

Common questions

Is North Cascades crowded in May?

No — May is one of the quieter months: 11% of the July peak, averaging 1,030 visits (NPS, 2021–2025).

What is the weather like in North Cascades in May?

Average highs of 69°F, lows of 44°F, 1.1″ of precipitation (NOAA 1991–2020 normals, STEHEKIN 4 NW, WA US station).

What should I pack for North Cascades in May?

Warm mid-layer (fleece or light puffy); Sturdy broken-in footwear, navigation and a basic first-aid kit — the full weather-computed list is on this page.

Is everything open at North Cascades in May?

State Route 20 (the North Cascades Highway) typically closes November–late spring due to avalanche danger. 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