No detected openings were recorded in the last 90 days. Campsite Sniper monitors Colonial Creek South Campground continuously and will alert you if that changes.
Of the 1,157 tracked site-nights (Sep 18 – Sep 30, 2026): 1,157 unavailable (cause unspecified).
No online availability right now
Load status
Sep 18 – Sep 30, 2026Of the 1,157 tracked site-nights (Sep 18 – Sep 30, 2026): 1,157 unavailable (cause unspecified).
Open dates by month
Sep 2026 – Sep 2026No month in range currently shows online availability. 0 open site-nights across the tracked window — these site-nights are marked unavailable.
Holiday windows
Sites open per night · of 89 sites| Window | Night | Sites open | Status |
|---|---|---|---|
| Labor Day | SAT Sep 5 | 0 | None open |
| SUN Sep 6 | 0 | None open | |
| MON Sep 7 | 0 | None open |
Labor Day: no online availability on any tracked night.
About Colonial Creek South Campground
Overview
Colonial Creek South Campground requires reservations during the peak season, from late May through early September of each year.
Important changes to booking windows: To better serve visitors, Colonial Creek South Campground will release campsites in two staggered block releases. These block releases will be 6 months in advance and 7 days in advance.
Campsites #64 - #95 and #116 - #164 are available for reservations 6 months in advance. Campsites #96 - #113 are available for reservations 7 days in advance.
Any sites not reserved during the peak season are available same-day as first-come, first-served for 1 night only and can only be claimed in person at the campground.
Colonial Creek South Campground may be open as first-come, first-served after the peak season until most of the campground closes for the year, typically in mid to late September.
Ten walk-in, tent-only campsites (#64 - #73) are open as first-come, first-served before and after the peak season, from January through late May, and early September through December of each year.
The campground is remote, yet bustling and is nestled in old-growth forest. Located on the south side of State Route 20 near milepost 130, there are 93 campsites that are surrounded by forest and located on Diablo Lake.
Colonial Creek South Campground can accommodate a variety of camping, whether it’s drive-in camping, or walk-in tent camping. The campsites vary in size from small to medium. Most of the campsites do not accommodate large trailers or RVs.
Recreation
Campers can access the Thunder Creek Trailhead from the South Loop. The Thunder Knob Trailhead is on the north loop across State Route 20.
Fishing is allowed in Diablo Lake with a Washington State Fishing license, the nearest location to purchase a license is in the town of Marblemount, WA. Follow Washington State Fishing Regulations when recreating.
Black bears are active in this campground and the surrounding trails. Be aware of your surroundings while hiking, picnicking, and camping. Use the provided bear boxes in your campsite to store coolers, cookware, and other odorants when not in use. If you encounter a bear around the campground or on a trail, inform campground staff or go to the North Cascades Visitor Center and fill out a bear report.
Facilities
The campground is located on the southern side of State Route 20, with some campsites along the lakefront of Diablo Lake. The entire facility offers drinking water, flush toilets, garbage and recycling, RV dump station, and some paved parking spaces, but most sites have uneven gravel parking. Each campsite offers a picnic table, bear box, and campfire ring.
Natural Features
Colonial Creek South Campground is surrounded by a forest of western redcedar, western hemlock, Douglas-fir, red huckleberries, and other native vegetation. The campground has easy access to Diablo Lake for recreating.
Nearby Attractions
Traveling west on State Route 20:
The North Cascades Visitor Center is 11 miles (18 km) west on State Route 20 from Colonial Creek South Campground, operating seasonally, typically from May to September. Campers can find the passport stamps, exhibits, park film, park store, and much more.
Traveling east on State Route 20:
Diablo Lake Overlook is 1.5 miles (2 km) east on State Route 20. the turquoise lake can be viewed safely from this area and there is ample day use parking and vault toilets.
Ross Lake Overlook is 5 miles (8 km) east on State Route 20, this is a less developed vista point. There are two pull off areas with interpretive way sides and with views of the Ross Dam and Ross Lake.
Getting there
Colonial Creek South Campground is located near milepost 130 on State Route 20. From Burlington, WA, drive 70 miles (113 km) east on State Route 20. From Twisp, WA, drive 71 miles (114 km) west on State Route 20.
View on Recreation.gov ↗ Get directions ↗
Photo gallery
FAQ
How do I get a reservation at Colonial Creek South Campground?
Campsite Sniper's current snapshot shows none of the 1,157 tracked site-nights open for online reservation at Colonial Creek South Campground. That can mean dates are reserved, closed, not yet released, or offered first-come, first-served rather than online. Pick a site on the map to see its calendar, or set a free Campsite Sniper alert. You complete the reservation yourself on Recreation.gov.
Does Campsite Sniper book this campground for me?
No. Campsite Sniper sends alerts and direct Recreation.gov links. It never books, pays for, holds, hoards, or resells reservations.
How current is this availability data?
Campsite Sniper re-checks public Recreation.gov availability for this facility every hour and republishes whenever anything changes. This facility's data last changed at Sep 18, 2026 16:19 UTC; an older timestamp means nothing has changed since that time, not that checking stopped. Always confirm final availability on Recreation.gov when you book.
Which sites at Colonial Creek South Campground fit a 35-foot RV?
6 of the 89 sites that support RV analysis have a recorded maximum of 35 ft or more; the longest recorded is 43 ft. 68 of those 89 sites have a recorded maximum length and 21 do not; they are not counted as fitting.
Does Colonial Creek South Campground have online availability right now?
As of the Sep 18, 2026 snapshot, none of the 1,157 tracked site-nights are open for online reservation. That can mean dates are reserved, closed, not yet released, or offered first-come, first-served rather than online. A free Campsite Sniper alert tells you if any date opens online.
Stop refreshing. Let the app watch it.
Lakefront, hookups, your RV length, weekends only - set it as picky as you want.
We run paced availability checks for Colonial Creek South Campground. One watch covers every matching site.
When a match opens, you get a push with a Recreation.gov link so you can review and book it yourself.