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    Boulder Reservoir

    The Insider’s Guide to the Boulder Reservoir

    It’s the ultimate vacation question: beach or mountains? Luckily, when you visit Boulder, you don’t have to choose! Okay, okay—so maybe we don’t have an ocean coastline. But Boulder does have the perfect spot to while away a day swimming, sunbathing and boating: Boulder Reservoir. Its cool, sparkling water and views of the Flatirons are hard to beat. 

    IMPORTANT: The Boulder Reservoir will be closed to all water-based activities September 1, 2020-March 2021. This is due to maintenance that takes place every 5-10 years. Walking, cycling and running will still be allowed.

    The 700-acre lake, often lovingly referred to as "the Rez," was initially created in the mid-1950s as a water-storage facility. But although it still supplies approximately 20 percent of Boulder’s drinking water, the lake and its surrounding environs quickly gained a reputation as one of the best spots in the state for boating, swimming, fishing and other lakeside recreation. 

    Covid-19 Update: Currently, the Boulder Reservoir is open to all 2020 watercraft permit holders, those with existing reservations at Rocky Mountain Paddleboard, and a limited number of passive shore recreational users per day. No swimming/tubing or rafting in the reservoir is allowed; and gathering places in the managed recreation areas of the south shore, including the beach, lawns and picnic areas are limited to groups of 10 and fewer. 


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    6 Things to Do at Boulder Reservoir

    The Basics: The Boulder Reservoir is open year-round. Entry fees are charged during the summer season from Memorial Day weekend through Labor Day weekend. Entry fee: $4 for youth (3–18), $7 for adults (19–59), $5 for seniors (60+). Dogs aren't allowed during the summer season.

    1. Swim and Sunbathe

    There’s something surreal about working on your tan while you stare up at mountains, and it’s an experience you won’t get many places besides Boulder Reservoir. The lake boasts one of the largest swimming beaches in Colorado. Splash around with the kiddos in the shallow section, swim out to one of the three floating platforms or simply lay on your beach towel and soak up the sun. The swimming area is open daily from Memorial Day to Labor Day, 10am to 6pm. A lifeguard is on duty, and children under 12 must pass a swim test to go beyond the first rope. Note: Swimming is prohibited in the event of lightning or thunder and the beach is closed for 30 minutes after any lightning strike.

    2. Boat

    Glide across the water in a sailboat or make some waves waterskiing behind a powerboat. Newbies can sign up for sailing classes or private lessons through Community Sailing of Colorado. The company also offers sailboat rentals, group lessons and parties, and free adaptive sailing clinics.

    Or if you’re looking for something a little more relaxing, rent a pontoon boat from Rocky Mountain Paddleboard and spend the day sipping, sunning and fishing. You can even rent a captain along with the boat! Note: Permits are required for all outside boats. Apply online. 


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    3. Paddle

    Explore the lake in a canoe, kayak or standup paddleboard (SUP). You can rent each by the hour from Rocky Mountain Paddleboard, which is located right on site at the Rez. 

    Or sign up for a lesson where a certified instructor will teach you the basics or help you perfect your technique. Yogis can put their practice to the test with SUP (standup paddleboard) yoga classes, held Mondays at 10am and Saturdays at 8:30am. Or try SUPilates! Note: Permits are included with rentals, but you’ll need to purchase one if you’re bringing your own watercraft. 


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    4. Fish

    Cast a line for bass, catfish, crappie, rainbow trout, saugeye and walleye from the fishing dock, shore or a boat. Follow the Boulder Reservoir Loop Trail for some of the best fishing access. Note: Purchase a fishing license from Colorado Parks & Wildlife online or in person. 


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    5. Run, Walk, Bike and Hike

    The park offers miles of trails for running, walking, mountain biking and hiking, including the 5.3-mile Boulder Reservoir Loop Trail. Keep an eye out for wildlife, as the park is home to geese, coots, loons, osprey, raptors, herons, owls, deer, rabbits, snakes and prairie dogs. Boulder Reservoir also plays host to a number of fitness events throughout the year, from 5K races to marathons and triathlons. And hey, what better way to cool down after a tough workout than with a dip in the lake?


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    6. Picnic or Potluck

    Got something to celebrate? Or just want to get out and grill? Boulder Reservoir's park has 13 picnic sites, nine of which are available to rent for private events from late April through September. Rentals include setup and takedown of canopies, picnic and serving tables, and trash, recycling and compost containers.

    Or simply pack a picnic lunch and grab one of the many first-come-first-serve picnic tables. Sand volleyball courts and horseshoe pits will keep you and your guests entertained. 

    Insider Tips
    • Winter Wonderland The Boulder Rez is a delight in winter. It's peaceful, the panoramas are snow-dusted and spectacular, you can bring your dog, and there's usually plenty of sunshine to warm you as you stroll around the Loop Trail. Plus, entry is free between Labor Day and Memorial Day.
    • For Fido Sorry, dogs aren’t allowed in the park during the paid summer season. But you can bring your canine companion for a dip before Memorial Day or after Labor Day! Or sign up for the Boulder Valley Humane Society’s annual fall fundraiser, the Doggie Dash: a fun run or walk around the lake with or without your pooch. 
    • Dash and Dine On Tuesday evenings in spring, the Dash & Dine 5K series at the Rez combines a fun 5K race and a post-race dinner with a party atmosphere. 
    • Triathlete Training The reservoir is perfect for open-water training for triathletes practicing their swim stage. There are drop-in sessions regularly in the summer and relaxed, swim-plus-5K events every Wednesday. Learn more about endurance training in Boulder.
    • Temp Check The water temperature in Boulder Reservoir changes daily. Call the front gate for the current water temperature: 303-441-3461.
    • Cold Bevies Alcohol is allowed at Boulder Reservoir (except on July 4), as long as it is not in a glass container. May we suggest picking up a six pack from a local brewery? Asher Brewing Company, Avery Brewing Company, Beyond the Mountain Brewing, Finkel & Garf Brewing Company and Gunbarrel Brewing Company are just a few minutes’ drive.

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