Fees and Hours at Union
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Hours and Fees at Union Reservoir Nature Area
Union Reservoir Park Hours
| TIMEFRAME |
OPEN HOURS |
|---|---|
| March 1 – May 31 | 6 am – 8 pm |
| June 1 – Aug 31 | 6 am – 9 pm |
| Sept 1 – Oct 31 | 6 am – 8 pm |
| Nov 1 – Feb 28 | 7 am – 6 pm  **Closed Nov. 27, 28, Dec. 24, 25 and Jan. 1 |
| Closed to water access | Dec 1 – Feb 28 (no water use) |
**Closed to all entry on Thanksgiving Day, Friday after Thanksgiving, Christmas Eve, Christmas Day and New Year’s Day.
Union Reservoir Fees
Please note: The Colorado State Parks Pass is not accepted at Union Reservoir. Union Reservoir is NOT a state park.
Daily Admission Fees
| Admission Type | Â Fee |
|---|---|
| Daily Vehicle Fee | $10.00* |
| Daily Weekend Vehicle Fee – Memorial Day through Labor Day. Includes Memorial Day, July 4 & July 5, and Labor Day. | $15.00 |
| Daily Watercraft Fee – includes canoes, kayaks, paddle boards, rafts, windsurfing boards | $5.00 |
| Trailered Boat | $10.00 |
| Bicycle / Walk-in (per person) | $2.00 |
| Colorado Disabled Veterans* | Free |
| Large capacity vehicles/buses: Daily vehicle fee + $2/person over 10 people |
NOTE: During special events, entrance fee may vary. View our Special Events webpage for details.
*Colorado residents with current Disabled Veterans License Plates may enter Union Reservoir for free. The veteran must be present in the vehicle. Includes daily vehicle fee and daily boating rates.
Union Reservoir Season Passes and Boat Storage
Please note: 2025 Season Passes are available online for purchase and renewal. Annual passes can be purchased, renewed, and/or picked up at Union Reservoir in May (weather & staffing permitting).
Season passes and boat storage may be purchased online through WebTrac
Please note: While season passes are available without residency restrictions, in order to receive the Longmont resident rate, a current city of Longmont Utility Bill must be shown as proof of residency. The vehicle that a pass is being purchased for must be present to pick-up the pass. Not sure if your address is within Longmont city limits? Enter the address into Longmont City GIS map.
| SEASON Pass Fees | Resident | Non-resident |
|---|---|---|
| 1st Car Vehicle Season Pass | $85.00 | $200.00 |
| 2nd Car Vehicle Season Pass | $65.00 | $140.00 |
| Watercraft Season Pass | $35.00 | $70.00 |
| 1st Car Seniors (55+) / Disabled | $55.00 | $128.00 |
| 2nd Car Seniors (55+) / Disabled | $45.00 | $90.00 |
| Trailer Boat | $70.00 | $132.00 |
| Public Boat Storage + | $635.00 | $1,256.00 |
| Public Boat Storage – Senior (55+) + | $605.00 | $1,184.00 |
+ Annual boat storage fee includes season pass and trailer boat fee.
Season Pass Detailed Information
For all Union Reservoir Season Passes:
•   Passes are non-transferable and non-refundable.  Vehicle and Watercraft passes are not valid unless permanently affixed to the vehicle lower left windshield.  Union is not responsible for lost passes.
•   Passes do not guarantee or provide preferred entry status. There is a one-in, one-out policy in effect when at full capacity.
•   A season pass does not cover entrance into Union Reservoir during special events or when Union Reservoir is closed for all or part of the day.
•   Longmont residents who desire resident pricing must show proof of a city of Longmont Utility Bill or copy of Longmont Lease at time of sticker pick-up.
•   Please note that water levels fluctuate and that water levels are not guaranteed.
A vehicle season pass does not include bringing in personal watercraft: paddle boards, kayaks, or canoes. A separate daily or seasonal watercraft pass is required in addition to a vehicle season pass to bring any type of up to 5 personal watercraft that the pass-holding vehicle carries.
Passes that are renewed prior to May have a direct-mailed option if the mailing address is confirmed during the renewal process. Please allow two weeks for stickers to arrive. Renewal stickers will begin direct-mailing the second week of January.
New & renewed passes will have sticker-pick-up events available in the spring. To be notified of sticker pick-up events, provide your email during the purchase/renewal process.
Union Swim Beach Hours
The Swim Beach is closed for the 2024 season!
Swimming is allowed at Union Reservoir only within the defined Swim Beach Area and only when lifeguards are present. Swim Beach use is included with Admission Fees/Pass Use during the hours below.
| Time of Year | Days of week | Â Open hours |
|---|---|---|
| Pre-Season (May 24 – 27) | Fri-Mon | 10 am – 5 pm |
| CLOSED May 28-31 | Mon-Fri | |
| Summer (June 1- Aug 13) | Mon-Thurs | 10 am – 6 pm |
| Fri/Sat/Sun | 10 am – 8 pm | |
| Aug 31 & Sept 1 | Sat/Sun | 10 am – 5 pm |
| Labor Day – Sept 2 | Mon | 10 am – 2 pm |
Open Water Swims
Open Water Swims provide a lap-swim-like experience in an open body of water. Buoys are used to mark out a roughly triangular course swimmers follow to swim an approximate 0.6 mile open swim course. Open Water Swims are supervised by lifeguards.
$10 per person. Season passes are not valid for Open Water Swim.
Register online for Open Water Swims
Special Season Value: after 15 paid open water swims, each additional session reserved will not be charged a fee even as registration remain required. Must be on roster or show receipt to participate. These per person fees include vehicle parking during the activity. Extended parking before/after the open water swim requires a day use or season pass.
| Â Time frame | Â Days of Week Open | Â Hours |
|---|---|---|
| Â June 4 – Aug 7 | Â Tuesdays and Wednesdays | Â 6:15 – 7:30 pm |
| June 8 – Aug 17 | Â Saturdays | Â 8:30-10 am |
| OPEN WATER SWIM | Â Fee |
|---|---|
| Season passes are not valid for Open Water Swim
Register online for Open Water Swims Special Season Value: After 15 paid open water swims, each additional session reserved will not be charged a fee but registration is still required. |
$10 per person |
Union Reservoir Park Shelter Rentals
Rent the Union Reservoir Playground/Blue Shelter for your next family gathering, picnic, or company party! The Blue Shelter is available for both half and full day rental options.
Full Day Rental
- Weekdays (Monday-Friday): $115
- No weekend availability
Half Day Rental (10am-3pm or 4-8pm)
- Weekdays (Monday-Friday): $57.50
- No weekend availability
In addition to shelter rental rates, daily vehicle admission and watercraft fees will apply.
Call 303-774-4364 or email RaShelle to make your reservation, or click here to reserve your time online. No refunds for inclement weather.
Miscellaneous Fees
Union Reservoir does not host ‘Full Moon Paddles’, but the full moon will rise regardless! Bring your boards, kayaks, canoes, and enjoy the magic of the evening glow. Please be advised, all water craft must be off the water 30 minutes before closing. No change in admission fees or season pass use.
