Dillon's Winter Belongs to Marina Park Until the Reservoir Freezes

Dillon's winter runs on two calendars. One is set by the Town and printed weeks ahead. It includes the Lighting of Dillon on Dec. 5 and the Holiday Market on Dec. 19 and 20, both at Marina Park. The other belongs to Dillon Reservoir and has no fixed date. The Lake Loops can't open until the ice allows it, and the track hasn't opened before January in any season the Town lists. Last winter it didn't open at all.

So for at least the first month of the season, Dillon's winter happens on the shore. Once you know how late the lake has been freezing, the shape of the season makes sense.

The Loops Have Never Opened Before January

The Lake Loops are the Town of Dillon's groomed winter track on the reservoir. It's open to walking, classic and skate skiing, snowshoeing and fat biking, with views of Peak One and Buffalo Mountain. The Town says the loops are weather-dependent and "normally open in mid-January and close in early March."

The Town's published season history:

Denver Water, which manages the reservoir, puts the average freeze date at Dec. 25, based on freeze and thaw records that go back to 1966. The opening days above landed two to four weeks after that average date. The ice needs time after freeze-up before the Town can groom on it. The Town measures ice thickness weekly to judge conditions around the track. It closes the loops and pulls the markers once melting makes the ice unsafe for its grooming equipment.

Last Winter, the Lake Froze After the Loops Usually Open

In winter 2025–26, the reservoir froze on Jan. 26, 2026. That's later than the opening day in any of the three seasons in the table. Summit Daily reported that it was the second-latest freeze on record. The latest came in the winter of 1980–81, when the reservoir froze on Jan. 31. The previous second-latest was Jan. 24, 2018.

Jimmy Luthye, Denver Water's senior media relations coordinator, told Summit Daily the late freeze came from warm temperatures early in the winter and high winds in December. By early January, Denver Water was already predicting a freeze near the end of the month, and that's what happened.

Last winter wasn't a one-off. In its Jan. 5, 2026 forecast story, Summit Daily counted 13 freezes on or after Jan. 1 across 59 years of records. Seven of them have come since 2010. More than half the late freezes in the record have come in the last 16 years.

The Town's Lake Loops page explains why last winter was lost. Conditions "never reached the consistency needed to safely prepare and manage the loops this winter," so the track went ungroomed for the 2026 season. The Town's Feb. 12, 2026 newsletter blamed both the record-late freeze and the persistent dry weather. It asked people to use caution around the reservoir and said the Town expected the loops back in 2027. That promise covers this coming winter, but the Town hasn't announced an opening date. Going by its own records, the earliest realistic window is mid-January.

The Reservoir Is Heading Into Winter Unusually Low

The lake going into this freeze looks very different from last year's. Denver Water reported Dillon Reservoir at 75% of capacity and down 22.5 feet as of July 31, 2026. By Sept. 23, Summit Daily reported it at 65% full. Denver Water had lowered its forecast to about 45% to 50% full by next spring, before runoff starts. At the low end of that range, the reservoir would sit below its level in the 2002–03 drought, when it fell to 48%.

The inflow numbers explain why. Nathan Elder, Denver Water's water supply manager, gave Summit Daily the totals. From April through July 2026, 47,559 acre-feet flowed into the reservoir. That's the lowest on record, well below the 2002 low of 56,695 acre-feet, and an average year brings about 160,000. August then set a record for the lowest monthly inflow. Denver Water's Oct. 12, 2026 update put its whole reservoir system at 67% full, against a typical 90% for that time of year.

Elder told Summit Daily what a recovery would take:

"Meaningful recovery will ultimately depend on improved fall moisture and, more importantly, a strong 2026-27 snow accumulation season."

As the water dropped this summer, Summit Daily photographed stretches of old road coming out of the reservoir. That shoreline will still be exposed when the lake freezes. Through the fall and early winter, the Town's standing advice is the one from its February newsletter: use caution around the reservoir.

December Happens at Marina Park, on Fixed Dates

While the lake waits, the Town's winter happens at Marina Park, 111 W. Lodgepole Street. Both of December's main events are on the calendar:

1. Lighting of Dillon and Holiday Lights Scavenger Hunt. Saturday, Dec. 5, 2026, 4:30 to 6 p.m. The lights go on at 4:45 p.m.
2. Dillon Holiday Market. In a heated tent on Saturday, Dec. 19, 10 a.m. to 6 p.m., and Sunday, Dec. 20, 10 a.m. to 4 p.m.

Both events fall before the Dec. 25 average freeze date. That's the gap the Town fills. The calendar holds December on the shore, and the lake typically picks up the season in January.

The heated tent matters too. In a December like last year's, warm and windy with open water past the holidays, an outdoor market still works without depending on the weather.

The Shore Itself Is a Work Site This Winter

The shoreline will look different this winter, too. The Town's Oct. 16, 2026 newsletter says the concrete plaza at Town Park Plaza is finished. The last phase is a 1,087-square-foot building with three accessible, gender-neutral restrooms, plus storage and utility space, along with sidewalk connections, utility work and landscaping. Town Council approved Crossland Construction Company's contract at its Oct. 6 meeting. Work is expected through winter 2026–27 and into spring, with completion anticipated by late May 2027, weather permitting.

An older Town project page gave June 2027 as the completion date. The October newsletter's late-May target is the newer schedule. The Town hasn't announced a skating rink or a winter skating plan for the plaza. Earlier this month, crews also worked on a waterline on E. La Bonte Street tied to the plaza project, from Oct. 13 to Oct. 15.

The plaza building and the Lake Loops are on similar timelines. Both are expected after the holidays, and neither has a firm date until conditions cooperate.

The Marina Is Already on Its Winter Clock

Dillon Marina, at 150 Marina Drive, switched to fall and winter hours on Thursday, Oct. 1. The office is open Monday through Friday, 9 a.m. to 3 p.m., and boat rentals and the launch ramp are closed for the season. The Town's ramp schedule shows the closure running from Oct. 1, 2026, through May 31, 2027.

STEEP Brewing Lakeside Tiki Bar has also closed for the season. Its regular season runs mid-May to mid-September, daily from 9 a.m. to sunset, and the bar plans to reopen in May 2027. This summer was STEEP's first as the marina's operator, after Pug Ryan's Brewing Co. closed its Village Place brewery in April. Summit Daily covered the handoff in June. In its September Marina Buzz, the Town said it looks forward to continuing the partnership next summer.

That leaves the marina quiet from now until the ice comes in. The Town's winter guide lists ice fishing, which starts as the reservoir freezes, along with cross-country skiing and snowshoeing on nearby trails.

When the Ice Does Come In

When the loops open, the entry points will be the same three listed on the Town's page: Lodgepole Street, the Dillon Marina, and the Eagle Statue at the top of Tenderfoot and Highway 6. The track is marked with red poly boo markers, each wrapped in colored tape to show which section you're on. If there's an emergency, the Town asks you to call 911 and give the color of your section.

The Town will announce opening day. Going by its records, that has been somewhere between Jan. 9 and Jan. 23 in the most recent seasons that opened, and later is possible if the reservoir repeats last winter.

For questions about how Dillon Reservoir affects life and property along Dillon's shoreline, from waterfront views to winter access, Lindblom Groupe is glad to talk it through. Scott and Anne follow the lake through every season and welcome a conversation whenever it's useful to you.