Walden Ponds

Walden Ponds at a glance

Walden Ponds Wildlife Habitat is Boulder County's answer to what you do with a worked-out gravel pit. Boulder County describes it as a place where nature's ability to heal, helped along by people, turned industrial gravel pits into a wetland habitat with year-round wildlife watching. It's flat, it's quiet, and it's the opposite of the Flatirons experience: instead of climbing for a view, you walk a few feet above the water and watch what lands on it.

About 2.6 miles of easy trails thread between the ponds. Around the wetlands sit roughly 100 acres of grasses, wildflowers, and trees, which is why the bird list here is so long. If you've got kids, a stroller, a bad knee, or an hour before work, this is one of the easiest places near Boulder to get outside and still see something wild.

Getting there and parking

There are three trailheads, and none of them charge a fee. Cottonwood Marsh is the main entrance, with 25 car spaces, 2 accessible spaces (one van accessible), a restroom, a covered picnic table, a 50-person group shelter, and two horse-trailer spaces. Wally Toevs has 13 car spaces plus 5 accessible spaces (two van accessible), a restroom, and a covered picnic table. Heatherwood is the small one, with 14 car spaces and 1 accessible van space. The park is day use only: it opens at sunrise, trailheads close at sunset, and you can't leave a vehicle overnight.

Accessibility

Walden Ponds is one of the more approachable outdoor spots in the county for anyone who can't take on a foothills climb. The terrain is flat, all three trailheads have marked accessible parking, Cottonwood Marsh and Wally Toevs both have restrooms and covered picnic tables, and a boardwalk runs out over Cottonwood Marsh so you can get close to the water without leaving a built surface. The trails themselves are gravel and dirt rather than pavement, so surface conditions vary with weather, and it's worth calling Parks & Open Space at 303-678-6200 if you need to know the current state of a specific stretch.

Fishing at Walden Ponds

Fishing is one of the main draws, and the rules are unusually specific. Anyone 16 or older needs a valid Colorado fishing license. Wally Toevs Pond is open exclusively to people 65 years and older, people with disabilities, and their youth companions who are 15 or younger, and it permits both artificial and live bait. Boulder County has stopped stocking Wally Toevs with trout, because warming summer water temperatures make it hard for a cold-water fish to survive there; the pond is still open and still holds warm-water species like bass, bluegill, and catfish. The county has also closed the Wally Toevs fishing pier for structural repairs, though the pond itself remains open to anglers.

At the other ponds it's artificial flies and lures only, with bluegill limited to 20, channel catfish to 10, and largemouth bass catch and release. Fishing is not allowed at Cottonwood Marsh at all. Boats and float tubes are prohibited everywhere on the property, and so is ice fishing.

Wildlife and birding

This is a birding destination first. The wetlands sit inside the Great Plains and pull in large numbers of migrating birds, and Boulder County publishes a bird checklist specifically for Walden Ponds and neighboring Sawhill Ponds. Beyond birds, the county's own species lists for the property include beaver, coyote, mink, mule deer, muskrat, raccoon, red fox, and striped skunk among the mammals, and painted turtles, snapping turtles, bullsnakes, garter snakes, and northern leopard frogs among the reptiles and amphibians.

Give animals room, don't feed anything, and keep your dog leashed: that last rule exists here because the whole point of the property is habitat. Our Boulder wildlife safety guide covers what to do if you meet something bigger.

Rules to know before you go

Boulder County signs Walden Ponds for day use only, pets on leash, bikes on designated trails only, no swimming, no boating, no hunting or firearms, and no camping. County-wide, swimming and wading are prohibited in all Parks & Open Space areas, drones are not allowed, smoking is prohibited, and e-bikes are prohibited except where specifically designated. Walden Ponds is one of the places where the county does allow e-bikes on its trails, alongside bikes and horses.

Picnic shelters

The Cottonwood Marsh shelter holds 50 people, has 5 picnic tables and restrooms nearby, and can be reserved through Boulder County for a $35 non-refundable fee. The Wally Toevs shelter is much smaller, at 10-person capacity with a single picnic table, and it's first come, first served with no reservations. Glass bottles, amplified sound, and extra structures are prohibited at county shelters.

Walden Ponds and Sawhill Ponds are not the same place

They sit right next to each other and look almost identical from a distance, but they're run by different agencies. Walden Ponds Wildlife Habitat belongs to Boulder County Parks & Open Space. Sawhill Ponds is City of Boulder Open Space and Mountain Parks, with its own rules, its own fishing regulations, and its own closures. The practical upshot: don't carry an assumption across the boundary. Read the sign at whichever trailhead you started from.

A little history

Gravel was first mined here in 1958, and the property was stripped 15 feet down to bedrock, leaving open pits and puddles of groundwater. In 1974, after county residents pushed for a wildlife habitat, Boulder County started a reclamation program: rock piles were compacted into dikes to create three ponds, two more ponds were added in the 1990s, and trees and shrubs were planted to help the land re-vegetate. Walden Ponds opened to the public in October 1975. The name has nothing to do with Thoreau, by the way. It honors Walden "Wally" Toevs, the county commissioner who drove the plan to turn the pits into habitat.

Best time to go

Early morning is the answer most of the year. The dikes are exposed, so summer afternoons get hot with almost nowhere to hide, and the birds are more active early anyway. Spring and fall migration bring the widest variety of species. Winter is quiet and often the best light. Boulder County posts current conditions and closures on the Walden Ponds page, and because this is a working wetland the water levels and fish populations do change, so it's worth a look before you drive out.

Nearby and related guides

• Sawhill Ponds: the City of Boulder property next door, with different rules.
• All hikes in Boulder: the full hiking hub, sorted by difficulty.
• Wildlife safety in Boulder: what to do when you meet something bigger than a muskrat.
• Hiking with dogs in Boulder: which agency's leash rules apply where.
• Best easy hikes near Boulder: more flat, short options.
• Boulder Reservoir: where to go when you actually want to swim.

Walden Ponds FAQ

Sources

Facts on this page are drawn from these authoritative sources:

• Boulder County Parks & Open Space: Walden Ponds Wildlife Habitat
• Boulder County Parks & Open Space: Regulations
• Boulder County Parks & Open Space: Fishing on Open Space
• Boulder County Parks & Open Space: Picnic and Park Shelters
• Boulder County: Birds of Walden Ponds Wildlife Habitat and Sawhill Ponds checklist (PDF)
• Boulder County: Walden Ponds Wildlife Habitat trail map (PDF)
• Colorado Parks and Wildlife: Fishing licenses and regulations