Openings · last 7 days
91
Booking reality
Campsite Sniper detected 91 site openings here in the last 7 days
01 · Detected Opening History · the openings record · file CS-233433
When Boulder Campground reopens
Boulder Campground's openings record: every site-date Campsite Sniper detected turning available, logged and time-stamped. Refreshed hourly.
Openings · last 30 days
173
Openings · last 90 days
176
Weekday pattern
Detected openings by day of week · 90dNo strong weekday pattern is evident in the openings Campsite Sniper has detected: 176 openings spread across the week.
Hour-of-day pattern
First detected by hour · local time · last 90 daysThe largest concentrations of detected openings were first detected during the 12:00 and 19:00 local-time hours. Those hours contained 63 of 176 detected openings (35.8%). Hours show when Campsite Sniper first detected each opening, in Central Time, not when the change was made upstream.
Lead-time profile
Days before stay date · percentilesHalf of the openings Campsite Sniper detected appeared at least 8 days before the stay date; the middle 50% land 3–14.2 days out. Set an alert if you want Campsite Sniper to monitor future openings.
Highest-churn sites
Most openings · 90d| Site | Openings | Share of all openings |
|---|---|---|
| 070 | 11 | 6.3% |
| 017 | 9 | 5.1% |
| 028 | 9 | 5.1% |
| 023 | 8 | 4.5% |
| 034 | 8 | 4.5% |
Site 070 had the most detected openings in the last 90 days: 11. One free watch covers every site here.
02 · Availability Outlook · Sep 18 – Oct 11, 2026 · of 82 monitored sites
Of the 1,968 tracked site-nights (Sep 18 – Oct 11, 2026): 625 open for online reservation · 1,343 reserved.
Where the open windows are
68.2% of tracked site-nights are not currently open for online reservation. 625 of 1,968 remain open; here is where they are.
Load status
Sep 18 – Oct 11, 2026Not open online68.2%
Open site-nights625 / 1,968
Reserved (of online inventory)1,343 / 1,968
Weekday openings425
Weekend openings200
Of the open site-nights on mapped sites, 425 fall on weekdays and 200 on weekends (Fri–Sun).
Open dates by month
Sep 2026 – Oct 2026September holds the most room. 471 of 1,066 site-nights are still open there.
Holiday windows
Sites open per night · of 82 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.
Best-availability sites
Most open site-nights · tracked window| Site | Open site-nights |
|---|---|
| 046 | 16 |
| 048 | 16 |
| 026 | 15 |
| 009 | 14 |
| 018 | 14 |
The 5 sites with the most open site-nights in the current snapshot. Pair a bookable date with a free alert to cover everything else.
Next windows
As of Sep 18, 2026 snapshotNext open dateFri · Sep 18
Next open weekendFri · Sep 18
The next bookable night is Sep 18; the first open weekend starts Sep 18. Campsite Sniper can watch later dates for you.
Stays and site detail
625 open site-nights across 76 sites at Boulder Campground, from the same hourly snapshot as everything above.
Multi-night stays. 122 2-night, 111 3-night, 17 7-night openings where a single site is free for every night, per Campsite Sniper's current snapshot — soonest Sep 18 at site 046.
RV length. Longest recorded site here is 101 ft. 82 sites take 25 ft, 82 sites take 35 ft, 82 sites take 40 ft.
Showing 60 of 76 sites with current availability
| Site | Max RV | Hookups | Open site-nights | Longest run | Dates |
|---|---|---|---|---|---|
| 046 | 60 ft | Yes | 16 | 13 nights | Sep 18, Sep 19, Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29 +4 more |
| 048 | 69 ft | Yes | 16 | 12 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +4 more |
| 026 | 70 ft | Yes | 15 | 7 nights | Sep 18, Sep 19, Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +3 more |
| 009 | 97 ft | Yes | 14 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5 +2 more |
| 018 | 65 ft | Yes | 14 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6 +2 more |
| 037 | 43 ft | Yes | 14 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 4, Oct 5, Oct 6 +2 more |
| 044 | 74 ft | Yes | 14 | 7 nights | Sep 18, Sep 19, Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 28, Sep 29, Sep 30, Oct 4, Oct 5 +2 more |
| 050 | 65 ft | Yes | 14 | 12 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +2 more |
| 045 | 90 ft | Yes | 13 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5 +1 more |
| 047 | 67 ft | Yes | 13 | 4 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7 +1 more |
| 057 | 75 ft | Yes | 13 | 7 nights | Sep 18, Sep 19, Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +1 more |
| 060 | 83 ft | Yes | 13 | 7 nights | Sep 18, Sep 19, Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +1 more |
| 079 | 92 ft | Yes | 13 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 4, Oct 5, Oct 6 +1 more |
| 015 | 85 ft | Yes | 12 | 7 nights | Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7, Oct 8 |
| 025 | 69 ft | Yes | 12 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 4, Oct 5, Oct 6 |
| 035 | 52 ft | Yes | 12 | 5 nights | Sep 18, Sep 19, Sep 20, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 11 |
| 043 | 65 ft | Yes | 12 | 12 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 |
| 051 | 66 ft | Yes | 12 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 11 |
| 052 | 50 ft | Yes | 12 | 12 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 |
| 064 | 80 ft | Yes | 12 | 11 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 8 |
| 081 | 75 ft | Yes | 12 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 8, Oct 9, Oct 10, Oct 11 |
| 023 | 73 ft | Yes | 11 | 6 nights | Sep 18, Sep 19, Sep 20, Sep 21, Sep 22, Sep 23, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 |
| 029 | 70 ft | Yes | 11 | 6 nights | Sep 18, Sep 19, Sep 20, Sep 21, Sep 22, Sep 23, Sep 27, Sep 28, Sep 29, Sep 30, Oct 11 |
| 039 | 77 ft | Yes | 11 | 7 nights | Sep 18, Sep 19, Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30 |
| 053 | 55 ft | Yes | 11 | 11 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30 |
| 054 | 60 ft | Yes | 11 | 8 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Oct 4, Oct 5, Oct 6 |
| 061 | 83 ft | Yes | 11 | 7 nights | Sep 18, Sep 19, Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Oct 4, Oct 5, Oct 6, Oct 7 |
| 071 | 65 ft | Yes | 11 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 28, Sep 29, Sep 30, Oct 1, Oct 7, Oct 8 |
| 010 | 83 ft | Yes | 10 | 4 nights | Sep 20, Sep 21, Sep 22, Sep 29, Sep 30, Oct 1, Oct 5, Oct 6, Oct 7, Oct 8 |
| 013 | 66 ft | Yes | 10 | 4 nights | Sep 20, Sep 21, Sep 22, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7, Oct 11 |
| 028 | 50 ft | Yes | 10 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 4 |
| 062 | 83 ft | Yes | 10 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 11 |
| 073 | 60 ft | Yes | 10 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 7 |
| 078 | 94 ft | Yes | 10 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 11 |
| 011 | 66 ft | Yes | 9 | 5 nights | Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 5, Oct 6 |
| 038 | 95 ft | Yes | 9 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30 |
| 040 | 65 ft | Yes | 9 | 4 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 11 |
| 042 | 79 ft | Yes | 9 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 |
| 063 | 68 ft | Yes | 9 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30 |
| 030 | 78 ft | Yes | 8 | 4 nights | Sep 20, Sep 21, Sep 22, Sep 27, Sep 28, Sep 29, Sep 30, Oct 11 |
| 059 | 52 ft | Yes | 8 | 7 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Oct 11 |
| 068 | 101 ft | Yes | 8 | 7 nights | Sep 18, Sep 19, Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Oct 11 |
| 080 | 75 ft | Yes | 8 | 4 nights | Sep 27, Sep 28, Sep 29, Sep 30, Oct 4, Oct 5, Oct 6, Oct 7 |
| 024 | 67 ft | Yes | 7 | 3 nights | Sep 20, Sep 21, Sep 22, Oct 4, Oct 5, Oct 6, Oct 11 |
| 082 | 83 ft | Yes | 7 | 5 nights | Sep 18, Sep 19, Sep 20, Sep 21, Sep 22, Oct 7, Oct 8 |
| 001 | 75 ft | Yes | 6 | 6 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26 |
| 019 | 65 ft | Yes | 6 | 4 nights | Sep 20, Sep 21, Sep 28, Sep 29, Sep 30, Oct 1 |
| 070 | 78 ft | Yes | 6 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Oct 11 |
| 072 | 95 ft | Yes | 6 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Oct 11 |
| 074 | 100 ft | Yes | 6 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Oct 11 |
| 076 | 78 ft | Yes | 6 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Oct 11 |
| 003 | 75 ft | Yes | 5 | 4 nights | Sep 23, Oct 4, Oct 5, Oct 6, Oct 7 |
| 012 | 62 ft | Yes | 5 | 4 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 27 |
| 017 | 48 ft | Yes | 5 | 2 nights | Sep 18, Sep 19, Oct 1, Oct 8, Oct 11 |
| 020 | 50 ft | Yes | 5 | 4 nights | Sep 24, Sep 27, Sep 28, Sep 29, Sep 30 |
| 033 | 78 ft | Yes | 5 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24 |
| 034 | 83 ft | Yes | 5 | 3 nights | Sep 21, Sep 22, Sep 23, Sep 30, Oct 1 |
| 056 | 68 ft | Yes | 5 | 4 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 27 |
| 065 | 74 ft | Yes | 5 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24 |
| 007 | 75 ft | Yes | 4 | 1 night | Sep 18, Sep 29, Oct 8, Oct 11 |
About Boulder Campground
Overview
Boulder Campground is situated on the eastern shore of Carlyle Lake, a prime getaway for city-dwellers and families. Located 50 miles east of St. Louis, the area offers the peaceful retreat of a small town combined with the grandeur of Illinois' largest manmade lake.
Recreation
Boulder Campground provides fun both on the water and on shore. Boat ramps and courtesy docks are provided, and the vast lake allows for plenty of water sports. Fishing is a popular pastime, and the lake offers year-round varieties of fish such as bluegill, crappie, channel catfish, flathead catfish, white bass, largemouth bass, freshwater drum, carp and walleye. There is an on-site playground and plenty of open space for children to play, as well as an amphitheater for educational programs. A multi-use biking and walking trail is located a short drive away at the dam.
Facilities
Boulder Campground offers 82 campsites, all of which have a view of the lake with some sites being perched directly on the shoreline. Each campsite is equipped with electric hookups and provides a picnic area with picnic table and fire pit. The campground has modern amenities such as flush toilets, showers and drinking water. It is adjacent to the Boulder Day Use Area which provides a boat ramp and fish cleaning station, as well as a reservable group picnic shelter.
Natural Features
Created in 1967, the 26,000-acre lake is recognized as one of the nation's top ten inland sailing lakes and hosts several annual races and regattas.
Carlyle Lake is home to an array of wildlife that can be seen throughout the year. Its waters and shores are a resting spot for migratory waterfowl and other birds. There are six established Watchable Wildlife Sites with viewing towers open to the public around the lake.
Nearby Attractions
The Carlyle Lake Visitor Center, located in the Dam West Recreation Area, has information available as well as nature exhibits on display, including a 215-gallon aquarium with native fish.
82 monitored sitesRVs up to 101 ft82 with hookups66 shadedPets OKFire pitsMax party 16
Getting there
Address: 25501 Boulder Access RD, Shattuc, IL 62231. From I-57, turn west onto Old U.S. Highway 50. Continue for 19 miles through Salem, Odin and Sandoval. Turn north on Boulder Road and follow seven miles to the campground.
801 Lake Road, Carlyle, IL 62231-9703618-226-3586
BikingBoatingCampingDay Use AreaFishingHikingHuntingInterpretive Programs
View on Recreation.gov ↗ Get directions ↗
03 · Field Photos · roll CS-233433 · facility + sites
Photo gallery
Roll CS-233433 · Boulder Campground · Carlyle IL12 frames · facility + sites
FAQ
How do I get a reservation at Boulder Campground?
Reservations for Boulder Campground are made through Recreation.gov. 625 of 1,968 tracked site-nights are currently open (31.8%). Campsite Sniper has also detected 176 site openings here in the last 90 days, so further dates may appear. 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.
How often do new openings appear at Boulder Campground?
Campsite Sniper detected 91 site-date openings at Boulder Campground in the last 7 days, 173 over 30 days and 176 over the last 90.
Can I get a multi-night stay at Boulder Campground?
111 three-night openings are showing, counting only runs where the SAME site is free for all three nights. The soonest starts Sep 18 at site 046. Confirm and book on Recreation.gov.
Which sites at Boulder Campground fit a 35-foot RV?
82 of the 82 sites that support RV analysis have a recorded maximum of 35 ft or more; the longest recorded is 101 ft.
Which month has the most availability at Boulder Campground?
September 2026, with 471 open site-nights in the current snapshot of 1,066.
How far ahead of a stay do openings appear at Boulder Campground?
Half of the openings Campsite Sniper detected appeared at least 8 days before the stay date; the middle 50% landed 3-14.2 days out. Campsite Sniper can monitor future changes for dates you select.
When is the next open date at Boulder Campground?
As of the Sep 18, 2026 snapshot: the next open date is Fri, Sep 18 and the next open weekend starts Fri, Sep 18. Detected openings can add earlier dates at any time; a free Campsite Sniper alert catches those the moment they appear.
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