CLOSURE UPDATE: Per mandate from Governor Polis, and because it is the right thing to do, our facilities are closed. Check here for COVID-19 updates. We are running emergency childcare only for families who have no other choice.


Whether you are joining us for a fun day by the pool or a serious lap swim workout, our pools in Boulder, Lafayette and Longmont will serve as your year-round aquatic headquarters. YMCA swim lessons, water fitness and recreational pool time are all available.

Arapahoe Y Pool Hours

Mon-Fri: 5:30am-9:00pm
Sat: 6:45am-7:45pm
Sun: 8:00am-6:00pm

Pool Schedule

Ed & Ruth Lehman Y Pool Hours

Mon-Thu: 5:00am-9:45pm
Fri: 5:00am-6:45pm
Sat: 6:45am-7:45pm
Sun: 8:00am-5:45pm

Pool Schedule

Mapleton Y Pool Hours

Mon-Fri: 5:00am-9:45pm
Sat: 6:45am-7:45pm
Sun: 8:00am-7:45pm

Pool Schedule


Pool Rules

  • Obey the lifeguards at all times.
  • Only Coast Guard-approved personal floatation devices (PFDs) allowed.
  • No glass on the pool deck.
  • Walk while on the pool deck.
  • Unsafe behavior, as determined by the lifeguards, is prohibited.
  • Swim suits must be worn at all times.
  • Members and guests of all ages must change clothes in designated locker rooms.
  • Diving is permitted only in the areas of the pool that are nine feet or deeper.
  • Young children who are not toilet trained must wear a swim diaper.
  • Appropriate language should be used at all times; vulgar or offensive language will not be tolerated.
  • Due to safety concerns, when the diving boards are available, the high dive will only be open during even hours and the deep-water slide will only be open during odd hours.
  • Children 11 and under must have adult supervision in the pool area.
  • All non-swimming children must have a parent or caregiver over the age of 18 in the water within arms’ reach. Only two non-swimming children per adult.
  • No inflatable devices used to hold a person or persons.
  • Only YMCA staff may teach lessons. Pool may not be used for non-YMCA sanctioned lessons.
  • Only noodles, kick boards, diving toys and balls are allowed.
  • Extended underwater breath-holding is prohibited.

Arapahoe Y Slide Rules

  • Minimum of 44" in height.
  • One patron may use a slide at a time.
  • All patrons must wait until the Lifeguard permits them forward.
  • Children under 12 must have a yellow band for shallow end slides and a green band for deep end slide (see Swim Test Policies below).

Proper slide position is as follows:

  • Feet first
  • Laying on your back
  • Arms at your side or crossed against your chest
  • Wait for clearance from the Lifeguard to enter the slide.

Arapahoe Y Diving Board Rules

  • One patron may use a diving board at a time.
  • All patrons must wait at the bottom of the stairs until the last diver exits the dive well.
  • Divers must walk up the ladder and jump off the board. No walking back and forth or unsafe hesitation.
  • Only one bounce allowed on the board.
  • Any flips, dives or jumps must be forward facing and out away from the diving board. No jumps or dives angled towards the side or other board.
  • Children under 12 must have a green band (see Swim Test Policies below).

Lap Lanes IllustrationLap Lane Etiquette

If the lanes are full, you may split or circle the lane. Observe each lane to get a sense of which one best matches your pace. Wait for the other swimmer(s) to finish their set, and then let them know you’ll be joining them. Decide together how you’re going to share the lane.

Splitting the Lane (for 2 swimmers): One of you swims on one side of the lane and one of you swims on the other. If you're splitting the lane, you stay in your half no matter what.

Circle Swim (for 2 or more swimmers): Much like traffic on a road, always swim on the right side of the lane. This means swimming on one side of the lane going down and the other side of the lane coming back. Swimmers move in a counterclockwise circle.


Pool Closures

YMCA staff may close the pool at any time for safety reasons, including but not limited to:

  • Chemical imbalance
  • Mechanical issue
  • Water clarity
  • Pool contamination
  • Natural dangers (lightning or thunder within 10 miles will constitute immediate closure for no less than 30 minutes from the last lightning strike or sound of thunder)

The YMCA reserves the right to alter this list or limit activities to protect the members and guests of the YMCA of Northern Colorado. For your safety and the safety of others, please obey all verbal instructions from YMCA staff.

Guest fees will not be refunded due to weather-related closures.

Swim Test Policy and Rules

Anyone under the age of 12 is required to perform a safety swim test in front of one of our certified Lifeguards. This policy is aimed at identifying the swimming capability of our younger patrons to ensure their safety as well as the safety of other members. Each test level is pass/fail and may be retaken one more time per day. After passing the test, the swimmer’s full name and most recent level will be kept in our log book for one year.

Red Band

The swimmer refused to take the test or did not pass the test. This is a non-swimmer and must have a parent in the water within arms’ reach even if they are wearing a Coast Guard approved personal flotation device. No more than two children per adult.

Yellow Band

The swimmer must jump in at the five-feet deep water, tread water for 30 seconds, float on his or her back 30 seconds and then swim forward across the length of the pool continuously.* Access to shallow end slides at the Arapahoe Y if height requirement is met (see slide rules) and access to shallow end at the Mapleton and Longmont Ys.

Green Band

The swimmer must jump in at the 5-foot section, tread water for 30 seconds, float on his or her back 30 seconds and then swim forward the length of the pool without touching the bottom of the pool.* Swimmers with green bands are granted access to the diving boards and slides at the Arapahoe Y and to the full pool at the Longmont and Mapleton Ys.

*The swimmer may use any stroke or method that provides continuous forward movement without touching the bottom of the pool. If they swim underwater they must break the surface regularly to breathe. The swimmer does not have to use any specific breathing pattern or technique.

The determination of swimming capabilities and band color of all swimmers is at the discretion of the Lifeguards or the supervisor on duty. At any time, a Lifeguard or supervisor may retest or revoke the permissions of any swimmer for safety concerns or policy violation.

Aquatics: Arapahoe Y

303-443-4474 ext. 3500

Aquatics: Ed & Ruth Lehman Y

303-443-4474 ext. 5502

Aquatics: Mapleton Y

303-443-4474 ext. 2501