Fees and Hours at Union - City of Longmont Skip to main content

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 – August 31 6 am – 9 pm
September 1 – October 31 6 am – 8 pm
November 1 – February 28 7 am – 6 pm

*Closed Nov. 23-24 for Thanksgiving

Closed to water access December 1 – February 28

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  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. Daily vehicle fee only, does not include boating rates.


Union Reservoir Season Passes and Boat Storage

Please note: 2024 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

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  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.

 Time frame  Days of Week Open  Hours
 June 4 - Aug 7  Tuesdays and Wednesdays  6:15 - 7:30 pm
June 8 - Aug 17  Saturdays  8:30-10 am
OPEN WATER SWIM  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.