Eagles at Dusk, Telescopes After Dark: Fossil Creek Reservoir's Winter Season Is About to Start

On Friday night, October 30, volunteers from the Northern Colorado Astronomical Society will set up telescopes at Bobcat Ridge Natural Area, west of Loveland and about 35 minutes from Fort Collins. It's the last of six skygazing nights the City of Fort Collins scheduled there between May and October. After that, the program moves to the reservoir at 3340 Carpenter Road.

Fossil Creek Reservoir Natural Area sits about a mile west of I-25 and two miles east of Timberline. Between November and February, it hosts the City's skygazing nights, and it's where the City's planned Eagle Watch sessions take place. From Fossil Creek Ranch it's a short drive.

The telescopes come to Carpenter Road

The City has posted two skygazing nights at the reservoir this winter:

1. Friday, November 27, 2026, 7 to 9 p.m., the night after Thanksgiving
2. Saturday, December 26, 2026, 6 to 8 p.m., the day after Christmas

Both require registration through the City's Engage activity page. Each one opens with a short, family-friendly astronomy activity, and then Northern Colorado Astronomical Society volunteers bring out their telescopes. The City's Natural Areas Explorer guide suggests dressing warmly and bringing water, plus a blanket or chair if you'd like to sit in the parking lot.

Two rules in that guide matter more than the gear list. The gate closes shortly after the start time, and parking on the road outside the gate isn't allowed. With a gate that closes soon after the start time, there's no slack for arriving late. On a holiday weekend, plan to get there early.

The eagles were here first

The skygazing nights are the City's addition. The reason the reservoir has a winter season at all is the eagles. In the City's words, bald eagles "from the north make Fort Collins their winter home" and "spend nights in communal roosts in cottonwood trees near the reservoir," according to its Eagle Watch event page.

Eagle Watch is built around those roosts. Volunteer naturalists set up at the viewing pier with spotting scopes and binoculars and explain the birds' natural history. The programs are free, you can drop in any time during a session, and you don't need to register. If you do sign up, you get email reminders and cancellation notices.

Last winter's sessions ran in the late afternoon. The City's archive shows Eagle Watch on Friday, December 26, 2025, and Saturday, January 3, 2026, both from 3 to 4:30 p.m. The 2026 Explorer guide says drop-in Eagle Watch programs are planned every Friday and Saturday from December through February, weather permitting. The City hasn't posted individual dates for the 2026–27 season yet, so check Engage before planning a specific afternoon around it.

December 26 could cover both

The two calendars overlap here. December 26, 2026, falls on a Saturday. If Eagle Watch keeps last winter's Friday-and-Saturday pattern and its 3 to 4:30 p.m. window, a December 26 visit could start at the viewing pier in the late afternoon and finish with the 6 p.m. skygazing session. The eagle session for that date hasn't been posted yet. The skygazing night has, and it requires registration.

The eagles roost there overnight in the cottonwoods, and the open sky over the water becomes the City's telescope site once it's dark. Both programs use the hours when most trails and parks are emptying out.

The weather rule that catches people

Eagle Watch isn't a fair-weather program in the usual sense, but it does have limits. The City says sessions may be canceled when temperatures are below freezing or when it's windy or foggy, and it asks visitors to check Engage for cancellations before they leave home.

On the Front Range, that rule rules out a lot of winter afternoons. A December or January Saturday that looks clear from your kitchen window can still be below freezing or windy enough to cancel the session at the pier. The email sign-up exists for exactly this, and it's worth doing before the first December weekend.

What last winter's count says about the season

The best recent numbers on wintering eagles come from the Northern Colorado Bird Alliance. Its February 2026 newsletter reported that the Fort Collins Christmas Bird Count, held December 20, 2025, recorded 60 bald eagles, up from 45 the year before. The same count found 103 species on count day.

Those 60 eagles are a total for the whole Fort Collins count circle, not a tally at Fossil Creek Reservoir. Against the previous year's 45, though, the number shows how many bald eagles were around the Fort Collins area last December, and the reservoir's roost is one of the places the City sends people to see them.

Before you go

Most of what trips up first-time winter visitors here is practical:

• No dogs. Pets aren't permitted anywhere in Fossil Creek Reservoir Natural Area. That includes Eagle Watch and skygazing nights.
• Hours. The natural area is open daily from dawn to dusk. The entrance is on Carpenter Road, also called County Road 32. The evening skygazing nights are scheduled, registered events.
• The walk. The spotting scopes and the best eagle viewing are a quarter to half a mile down a gently sloping, paved trail that is ADA accessible. Accessible parking and restrooms are available.
• Beyond the pier. The City describes a half-mile paved loop to an accessible birding platform, plus road-base trails of half a mile and two miles that lead to birding blinds.
• Possible closures. The City's Fossil Creek Reservoir Natural Area page lists Heron Loop, Sandpiper Trail and Cattail Flats Trail. It says trails may close seasonally as needed to protect eagle roosting areas and shorebird and waterfowl habitat. Check posted signs before you head down a longer trail.
• What to bring. Binoculars if you have them, plus warm layers.

For now, the only reservoir dates on the City's calendar are November 27 and December 26. The Friday and Saturday afternoons at the viewing pier will join them once the City posts them.

Steve Baumgaertner can tell you how easy access to places like this natural area shows up in what nearby homes are worth. If you've been thinking about your own home's value this winter, Forever Front Range can put a clear number on it. Request a Free Home Valuation.