"All designated trails around these closures will remain open." That line comes from the City of Boulder's seasonal wildlife closure notice. It matters now because on Sunday, Nov. 1, Open Space and Mountain Parks starts its yearly bald eagle closures on the plains east of town, and they stay in place until July 31.
The Nov. 1 closures cover open ground beside the trails and leave the trails themselves open. The one East Boulder trail that is fully shut this November is closed for a bridge on Baseline Road. For anyone who walks the eastern open space, November changes where you can step and adds something worth watching for. Your loop stays the same.
What Changes on Nov. 1
The OSMP closures page lists the bald eagle areas that close from Nov. 1 through July 31:
- The Kolb, Weiser and ERTL properties, east of 75th Street and north of Valmont Road
- The entire Short and Milne property, along Boulder Creek east of 61st Street
- The Coal Creek and Boulder Valley Farm properties
The same page says the area closures "do not close any designated hiking trails." In practice, the rule is about leaving the trail. Under the city's notice, OSMP and Urban Park Rangers patrol seasonal closures, and anyone who walks into a closed area may be fined. The notice asks visitors to stay on designated, maintained trails outside the closed areas.
The closures can also end early. The notice says staff and volunteers check the sites regularly and will lift raptor closures if they don't see nesting activity.
Why This Ground Gets the Protection
In its 2025 notice, the city said the bald eagle areas protect habitat for two nesting pairs and help them raise their young. The notice also points out that bald eagles are federally protected under the Bald and Golden Eagle Protection Act.
Boulder County's 2025 wildlife annual report shows how those nests did across the county. All eight bald eagle nests it monitored were active, nesting success was 88%, and 13 young eagles fledged. Those are countywide numbers, so they don't tell you how the two East Boulder pairs did. They do show that nests on these plains are being used, and that a nest left undisturbed can produce young.
The calendar keeps going after November. OSMP's closures page says golden eagle closures now begin Dec. 15 and also run through July 31.
The Closure That Actually Removes a Trail
The trail loss East Boulder walkers are feeling right now comes from road work. OSMP closed the Dry Creek Trail and Trailhead on Aug. 24, and they stay closed through November 2026 while Boulder County replaces a bridge on Baseline Road.
According to the county's project page, the old bridge carries Dry Creek #3 under Baseline Road east of Baseline Reservoir. The new, larger bridge will drain more water. Crews are also replacing the guardrail, restoring the creek's channel, improving nearby wetlands, and repaving and restriping the road. Xcel's utility relocation is finished, and the bridge replacement is underway.
If your loop runs that way, three details matter:
- Baseline Road is fully closed between Cherryvale Road and 75th Street, and the county says the closure will last into November.
- Traffic is detoured to South Boulder Road or Arapahoe Road.
- Every RTD 225 bus stop between 75th Street and Cherryvale Road is closed, and the route runs on South Boulder Road for now.
So in November you can't use the Dry Creek trailhead, and you can use every trail around the eagle areas. The rest of this post is about those open trails.
Where to Watch From the Trail
Eagles hunt over open water and prairie, and East Boulder has public sites with both. None of the sources below promises a sighting, but each one describes habitat where raptors and winter birds turn up. Dog rules change from site to site and matter more in this season than in most.
| Site | Why it draws birds | Rules to know |
|---|---|---|
| Teller Farm | Farmland, cottonwoods, riparian corridor and lakes, with prairie dog colonies near Teller Lake #5 that attract raptors | No dogs north of Valmont Road or within 100 yards of Teller Lake |
| Legion Park | A hilltop with long views over the prairie, and a scan point for the Valmont Reservoir complex | Day use only; pets on leash |
| Valmont Reservoir complex | Bald and golden eagles and ferruginous hawks hunt here during spring and fall migration | The east-side approach by the OSMP office is gated outside weekday business hours |
| Walden Ponds and Sawhill Ponds | Wetlands where ducks and shorebirds stop from fall through spring | Walden is day use only; pets on leash |
| Boulder Reservoir | Bald eagles and osprey are listed as likely, especially in autumn | Check current access and dog rules with the city before you go |
Boulder County Audubon says Teller Farm offers good birding in every season. Boulder County's Legion Park page suggests bringing binoculars because "you may catch sight of a swift raptor diving for prey." The Colorado Birding Trail's guide to the Valmont Reservoir complex names Legion Park as a free scan point that is open year-round during daylight. That makes it the easy choice for an evening or weekend, when the gate on the east side is closed.
The open trails and the closed parcels share the same eastern plains. OSMP's map puts the Kolb, Weiser and ERTL closure north of Valmont Road, and Teller Farm's dog rule also starts at Valmont Road. Both are set up to keep people and dogs off the ground where eagles feed and nest. A walk on the open side of that line is a good way to see what the closures protect.
White Rocks and Bobolink are East Boulder favorites, but the sources here don't describe either one as a winter raptor site. The city's White Rocks page describes creek and farmland bird habitat, requires visitors to stay on the trail, and bans dogs in the Nature Preserve. Bobolink is best known for its nesting bobolinks from late May through mid-July.
Dates to Know This Season
If you'd like someone else to find the birds, local groups have dated walks on the calendar between now and the end of the year:
- Sunday, Nov. 1, 1 to 3 p.m. Boulder County Audubon lists a free bird walk at Greenlee Wildlife Preserve in Lafayette, led by the City of Lafayette Open Space. No reservation is needed, experienced birders are on hand, and beginners are welcome. It happens to fall on the day the eagle closures begin.
- Thursday, Nov. 19, 10 a.m. to 12:30 p.m. Boulder County's events calendar lists Hikes for Seniors: Migrating Raptors. Check the county calendar for the location and sign-up details.
- Saturday, Nov. 21, 9 a.m. to noon. Boulder County's calendar also lists a Birds of Prey Driving Tour.
- Sunday, Dec. 6. Boulder County Audubon returns to Greenlee Wildlife Preserve for a drop-in walk that starts at 1 p.m.
- Sunday, Dec. 20. The Boulder Christmas Bird Count welcomes birders at every level. Teams cover the city, the plains and the foothills, and each team sets its own count times.
The Weekend Valmont Gets Loud
Raptor season shares the calendar with one big event. Boulder Junior Cycling brings the Boulder Cup cyclocross races to Valmont Bike Park on Nov. 14 and 15. Each day is a separate race, with top-level and amateur fields. The organizers list food trucks, music and kids' activities, plus a course with stair run-ups, sand pits, off-camber turns and steep hills. If you're thinking of racing, early registration closes Wednesday, Nov. 4, at 10 p.m., and the price goes up by $5 after that. Regular registration closes Wednesday, Nov. 11, at 11:59 p.m.
If you want a quiet morning with binoculars that weekend, Legion Park and Teller Farm are farther from the racing.
Warming Up Afterward
After a cold morning at Teller Farm or Legion Park, East & Co. at 2100 Central Ave. in Flatiron Park is close by. Its FAQ lists weekday hours of 7 a.m. to 8 p.m. The Rayback, at 2775 Valmont Road, sits on the same road that marks the eagle closure line farther east.
A November walk in East Boulder still uses the same trails. Just stay on them, and bring binoculars.
The team at Wood Residential knows East Boulder by its trailheads and season dates. If you're wondering how open space sits next to the streets you're considering here, from Teller Farm to the Valmont corridor, request a private neighborhood consultation and we'll go through it with you.
