Union Reservoir Nature Area in Colorado

Exploring Union Reservoir Nature Area in Longmont

Longmont, Colorado

Rating 4.6 (776)
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Swim beachLifeguardsOpen water swimPlaygroundRestroomsVolleyball

Difficulty

Easy

Best Season

Memorial Day weekend - Labor Day

Depth

Designated swim-beach depth varies

Entry Fee

Daily vehicle fee is $10, weekend/holiday vehicle fee is $15, and walk-in/bicycle admission is $2.

Parking

Paved parking at 461 County Road 26; beach and reservoir hours vary by season.

Last Verified

2026-04-08

Union Reservoir Nature Area Guide: Can You Swim Here?

Are you wondering about swimming at Union Reservoir Nature Area? City-managed reservoir with a staffed swim beach, open-water swim programming, restrooms, playground, and strong map support for warm-season swimming.

How to Visit Union Reservoir Nature Area

Planning a trip? Here are some essential tips for how to visit Union Reservoir Nature Area. The exact coordinates are 40.1725589, -105.0453153. Make sure you enter these into your GPS to find the most accurate trailhead or access point. Look out for parking signage, as paved parking at 461 county road 26; beach and reservoir hours vary by season..

Safety Tips & Local Warnings

While exploring the Union Reservoir Nature Area guide, safety should always be your top priority. Natural swimming holes face rapidly changing water conditions. Entry fees are currently listed as: Daily vehicle fee is $10, weekend/holiday vehicle fee is $15, and walk-in/bicycle admission is $2.. Be mindful of your surroundings and any posted warnings when visiting.

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