Horsetooth Reservoir can be a lake day, paddling trip, fishing stop, campsite or scenic drive—but a smooth first visit starts with choosing the right access area and understanding Larimer County’s permits and water rules.
This Horsetooth Reservoir guide uses official information current on November 15, 2026. Parking capacity, water levels, swim-beach status and boat-ramp hours can change with season, weather and staffing, so check conditions again on the day you go.
Horsetooth Reservoir at a glance
The Larimer County Horsetooth Reservoir page describes a 6.5-mile reservoir west of Fort Collins, surrounded by approximately 1,900 acres of public land. Recreation includes boating, fishing, camping, picnicking, swimming, scuba diving, rock climbing and water skiing.
The reservoir is part of the Colorado-Big Thompson Project. The Bureau of Reclamation and Northern Colorado Water Conservancy District manage water levels for water supply, irrigation and hydropower purposes, while Larimer County manages recreation. It is open year-round, but individual facilities and activities are seasonal.
If you are exploring the area as a possible home base, the Fort Collins community guide provides a broader look at neighborhoods, trails and local amenities.
Which entrance should a first-time visitor use?
South Bay is the most practical starting point when you want information and several recreation options in one area. The Horsetooth Area Information Center is there, along with the South Bay campground, group pavilion, swim beach and boat ramp.
Inlet Bay is the access point for Inlet Bay Marina and Inlet Bay Campground. Continue west on County Road 38E past the South Bay entrance, then follow signs to Shoreline Drive.
Confirm the destination—swim beach, marina, campground, trailhead or day-use area—before leaving.
Entrance permits and parking
Larimer County requires an entrance permit. Its current permit page lists daily reservoir permits at $10 per vehicle, $10 for a boat trailer only or $20 for a vehicle and boat trailer. Daily permits are valid for 24 hours from the purchase date.
Visitors can purchase at self-serve stations, the information center, with a camping reservation or through Text2Park after parking. A Text2Park permit is tied to the vehicle’s license plate, but purchasing one does not reserve or guarantee a parking space.
Larimer County also states that its reservoir parks are not covered by Colorado’s Keep Colorado Wild Pass or the federal America the Beautiful Pass. Use the County permit that applies to your vehicle and trailer.
During busy periods, parking can fill early. The County recommends weekdays or weeknights, weekend arrival before 8 a.m. or after 2 p.m., and a backup destination. Visitors can text lcboating to (833) 581-0014 for reservoir parking-capacity alerts.
Swimming rules and seasonal beaches
Horsetooth Swim Beach and Sunrise Swim Beach generally operate from Memorial Day weekend through October 1, although exact opening and closing dates vary. Call 970-619-4570 or check the County page for current status.
County regulations permit swimming only in designated areas: no-wake zones within 50 feet of shore. Swimming is prohibited in the main channel and within 150 feet of boat ramps, docks, buoys, dams or structures unless a stated exception applies.
Cliff jumping and diving from land, rocks or structures are prohibited. Children younger than 13 must have adequate adult supervision while swimming or participating in water recreation.
Dogs are not allowed on swim beaches or in designated swimming areas. Alcohol is also prohibited at swim beaches and in day-use areas.
Boating, paddleboards and inspections
Every vessel entering Horsetooth Reservoir must receive an Aquatic Nuisance Species inspection before launch. This requirement applies to motorboats and paddlecraft, and launch access is limited to inspection hours.
The Larimer County boating page publishes seasonal hours for South Bay, Inlet Bay and Satanka ramps. Schedules differ by ramp, and a ramp may close because of weather, water level or staffing. Check the current page before towing a boat to the reservoir.
Bring any prior inspection receipt or seal, and arrive with the watercraft clean, drained and dry. Stop for the exit inspection when leaving. The County requires personal flotation devices and directs boats to travel counterclockwise at Horsetooth. Wakeless zones have a five-mile-per-hour maximum.
Paddlers should not confuse a lightweight board or kayak with an exemption from safety and inspection requirements. Confirm launch location, wind forecast and return route before entering the water.
Dogs, alcohol and other park rules
Away from swim beaches, dogs must remain on a leash no longer than 10 feet. Bring waste bags and water, and avoid hot surfaces during summer.
Alcohol is allowed only in campsites and on boats—not in day-use areas. Glass containers, drones, fireworks and firearms are prohibited. Quiet hours run from 10 p.m. to 6 a.m. Recreation is not allowed on dams or within 100 feet of a dam while on land.
These rules are a starting point. Review the 2026 Larimer County Natural Resources regulations for the complete requirements that apply to swimming, fishing, boating, paddleboarding, camping and pets.
Camping and year-round planning
Camping requires both a campsite reservation and the applicable park entrance permit. Reserve the correct campground and verify check-in instructions before arriving; campground water and some facilities can be limited in cold-weather months.
In winter and shoulder seasons, the reservoir remains open, but swim beaches close and boating access narrows. Check County webcams, weather, water levels, road conditions and facility notices. Expect fast-changing wind and weather on the water.
For another Northern Colorado outing with a different trail experience, see the Devil’s Backbone Wild Loop guide.
Horsetooth Reservoir FAQ
Can I visit without paying if I do not launch a boat?
A valid entrance permit is still required for a vehicle entering the reservoir recreation areas. The current daily vehicle permit is $10.
Can dogs swim at Horsetooth Reservoir?
Dogs are not allowed at the swim beaches or in designated swimming areas. Elsewhere, keep them on a leash no longer than 10 feet and follow posted rules.
Is cliff jumping allowed?
No. Larimer County prohibits jumping or diving from land, rocks, objects or structures into the water.
Does a day-use permit guarantee parking?
No. The County specifically says a Text2Park purchase does not guarantee a space. Check capacity alerts and keep a backup plan during busy periods.
Considering a home near Horsetooth Reservoir or comparing Fort Collins locations by access to recreation? Ask Brandon about the property for real-estate guidance, and verify park conditions directly with Larimer County before each visit.