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Knocktober 3K Knockout Swim Series - October 3rd, 2026 Register Now
October 3rd, 2026

About Lake Montclair


Water Quality

Water quality gets tested 1 week prior to the event. The community tests for algae and e-coli. Typically the water is between 68-75F on race day. The most recent test results from August of 2025: https://www.montclairva.com/single-post/mpoa-weekly-update-august-29-2025

Results will be uploaded the week of the race.

Location

4398 Spillway Lane, Montclair, VA 22025

One of three beaches used to access Lake Montclair. Playground and covered pavilion with picnic tables and barbecue grills on opposite hilltops. Basketball hoops and a volleyball court (volleyball net available during beach season). Fishing pier and large amphitheater overlooking the lake. Large grass field behind parking lot. Public restrooms available during beach season. This park is open from dawn to dusk.

History

Lake Montclair is a man-made, 108-acre recreational lake in Dumfries, Virginia, created over 50 years ago by damming Powell's Creek to serve as the centerpiece of the Montclair planned community, established in 1969. Managed by the Montclair Property Owners' Association (MPOA), it serves residents with three beaches and recreational boating.

Frequently Asked Questions


The 3k Knockout Series is scheduled for Saturday, October 3rd, 2026, at Dolphin Beach (located at 4398 Spillway Lane, Montclair, VA).

Participants can choose from three different race options:

3K Knockout Series

1k

Splash & Dash

Yes, a pre-race open water swimming clinic is typically held the evening before (Oct 2nd, 2026) at Dolphin Beach. It is free for registered festival participants and available for a small fee for non-participants.

The event is open to all swimmers, including non-USA Swimming members. However, there are age and experience recommendations for longer distances:

750m: Ages 9 and up.

1.5K: Ages 11 and up.

2.5K: Ages 11 and up.

5K: Recommended only for those with prior open water experience; athletes must be at least 13 years old.

While it is a sanctioned meet, non-members can purchase a one-day event membership (approx. $12–$15) to participate. This must be completed 1–3 days prior to the event; no on-site registrations are permitted on race day.

The freshwater lake is expected to be between 64°F and 68°F.

If the water temperature is below 78°F, wetsuits are generally permitted. For competitive USA Swimming scoring, specific FINA/USA Swimming rules regarding wetsuit thickness (3mm–5mm) and coverage apply.

Race caps are provided in packets, goggles, and a parka for after the race as it's pretty cool most years. While water and bananas are provided post-race, bringing personal hydration recommended. A food truck will be at the meet as well.

On-site parking at the beach is reserved for officials, volunteers, and spectators/athletes with disabilities only. Spectators and participants are to park at Moncure Park or Pattie Elementary School.

Entrants with qualifying times (see meet announcement) all participate in the 1.5K race. Those that place in the top 50% will advance to the 1K race. When the 1K finishes, again the top 50% of that race will advance to the 500m race. Whomever places first in the 500m race is the overall winner of the 3K Knockout.