Keyhole State Park - United States
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About Keyhole State Park
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Best time to visit Keyhole State Park
Late May through early September is the prime window, when warm days encourage swimming, paddling, and lake fishing, and all campground loops, boat ramps, and the marina are typically open. July and August bring the warmest water and the busiest weekends, so reservations help. June and September are excellent shoulder seasons for RV travel with cooler nights, fewer crowds, and easier campsite availability, though some services may scale back after Labor Day.
Cold winter conditions; most campground services closed, day-use access only.
Reservoir often ice-covered; campground services closed, limited winter access.
Variable spring weather, possible snowstorms; full campground services not yet open.
Shoulder season; some campground loops opening as conditions allow.
Wettest month; campgrounds generally open by mid to late month.
Pleasant temperatures and full services; afternoon thunderstorms possible.
Peak season; reservations recommended.
Warm and dry; warmest lake temperatures.
Quiet shoulder season; cool nights, excellent fishing.
Reduced services after early fall; freezing nights common.
Most campground services closed for the season; day-use only at many areas.
Winter conditions; campground services closed, ice fishing possible when safe.
Things to do at Keyhole State Park
- Boating and Paddling on Keyhole ReservoirRV parking available
Keyhole Reservoir is the park's centerpiece, with multiple boat ramps and a marina serving powerboats, sailboats, kayaks, and stand-up paddleboards. Open coves and quiet bays make it a relaxed paddling lake. All watercraft launching on Wyoming waters require a current AIS decal, with inflatables 10 feet or less exempt.
- Walleye and Bass FishingRV parking available
The reservoir is one of northeast Wyoming's best-known warmwater fisheries, with walleye, smallmouth bass, northern pike, catfish, perch, and crappie. Anglers fish from boats and from accessible shoreline points throughout the park. A Wyoming fishing license is required.
- Swim Beach and Day Use EasyRV parking available
A designated swim beach offers a sandy area for cooling off during summer heat. Adjacent picnic areas have tables, shade shelters, and parking large enough for tow vehicles and smaller RVs.
- Wildlife and Bird Watching Easy
Keyhole's mix of prairie, shoreline, and ponderosa pine attracts a wide variety of wildlife, including white-tailed deer, pronghorn, wild turkeys, and waterfowl. Migrating pelicans, eagles, and shorebirds are highlights for birders during spring and fall.
- Day Trip to Devils Tower National Monument EasyRV parking available
Devils Tower is an easy day trip from Keyhole, lying northwest of the park via I-90 and US 14. The monument is located about 27 miles northwest of Sundance, and its visitor center, paved Tower Trail, and picnic areas are accessible to RV travelers.
- Bearlodge and Black Hills Side Trip Easy
The Bearlodge Ranger District of Black Hills National Forest lies just east of the park around Sundance. The district covers roughly 200,000 acres in the northwestern Black Hills within Wyoming, with trout fishing, snowmobile trails, hunting, hiking, and camping nearby. Forest roads and short hikes give RVers a cool, forested contrast to the prairie reservoir.
- Stargazing
Far from major city lights, Keyhole offers excellent dark skies on clear nights. Open lakeside campsites and day-use areas give wide horizon views of the Milky Way during summer.
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RV Rentals Keyhole State Park
Keyhole State Park, WY, United States
How to get to Keyhole State Park
From Gillette, Wyoming the drive is roughly 50 miles east on Interstate 90 to the Pine Ridge Road or Moorcroft exits, about an hour by RV. Sundance lies about 19 miles east of the park along Interstate 90, and Rapid City, South Dakota is approximately 130 miles east, around two and a half hours. The route is flat to rolling prairie with no tunnels, low bridges, or significant mountain passes, making it RV-friendly, though strong crosswinds along I-90 can affect high-profile rigs. The nearest commercial airport for fly-and-rent travelers is Gillette-Campbell County Airport, with Rapid City Regional Airport offering more flight options.
RVezy vs. Traditional RV rental
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Traditional RV rental
- Limited fleet from a rental company
- Exact RV not guaranteed
- Pickup only at retail locations
- Fewer RV types and less availability