Post Oak Park is a national park campground at Copan Lake in Washington County, Oklahoma. Reservations are managed through Recreation.gov. When a booked site here is cancelled it can vanish within minutes, so Campsite Tonight monitors it 24/7 and auto-adds the opening to your Recreation.gov cart before anyone else.
Post Oak Park is in very high demand — sites here routinely sell out well in advance. Cancellations are often the best way in, which is exactly what Campsite Tonight watches for.
The campground accommodates RVs and trailers up to 83 ft. Campers rate it 4.0/5 across 96 reviews.
Other campgrounds at Copan Lake include Copan Point and Washington Cove.
Total reservations in April — 2023: 113 · 2024: 95 · 2025: 82
Address
Copan, Oklahoma
Coordinates
36.8975, -95.9697
Very high demand - sites typically fill up immediately when the booking window opens. Plan to book the moment reservations open.
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