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Entrance
Free
+ permits required
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⭐ Highlights
→Cascade Pass — dramatic 7.4 mi RT to high country
→Diablo Lake — turquoise glacial lake overlook
→Boston Basin — world-class alpine climbing approach
⚠ Before you go
!One of least-visited parks — minimal facilities
!Backcountry permit required for all overnight stays
!Road 20 closes November through May
When to visit
North Cascades by Season
Spring (May–Jun)
Wildflowers beginning.
Summer (Jul–Sep)
Only full-access season.
Fall (Oct)
Brief window before snow.
Winter (Nov–Apr)
Road closed. Expert skiing only.