Closed for the 2026 season; when operating, this no-hookup Diablo Lake campground accepts RVs and trailers up to 25 feet.
Colonial Creek North closed for the season on September 14, 2026. During its operating season it has no electric hookups, is not large-RV friendly, and lists a 25-foot maximum for both RVs and trailers. Reservations are used during peak season before the campground switches to first-come availability. Check the current NPS camping page and SR 20 conditions before planning a future stay.
Vehicle access is currently unavailable. See the official access guidance above.
Colonial Creek campground sits on the shores of Diablo Lake, whose extraordinary turquoise color comes from glacial flour — finely ground rock suspended in the meltwater draining from North Cascades glaciers. Thunder Creek trail climbs from camp into the heart of North Cascades National Park's wilderness, passing through old-growth forest before reaching glaciated alpine terrain that connects to the park's roadless interior. The North Cascades ecosystem supports one of the most diverse assemblages of large carnivores in the contiguous United States, including black bear, mountain lion, wolverine, and a growing population of gray wolf.
Practical guidance assembled from current operator maps, park pages, and clearly identified community observations.
Do not plan an overnight stay during the seasonal closure. When NPS reopens the campground, select the exact site for your equipment and keep both RVs and trailers at or below the published 25-foot maximum.
| 📍 Nearest Town | Sedro-Woolley, WA |
| ⛽ Gas Station | 22 mi |
| 🛒 Grocery Store | 40 mi |
| 🏪 Costco | 50 mi |
| ☕ Starbucks | 40 mi |
| 🏕️ Nearest State Park | 30 mi |
Stock up in Sedro-Woolley, WA before heading out — services get limited near the campground.
Ready to book?
Campground closed for the 2026 season; seasonal reservations return when the campground reopens. Confirm current rules, site dimensions, and conditions with the operator. Booking and availability are handled externally.