Leave No Trace

Leave No Trace is a Boulder organization that seeks to teach outdoor ethics on public lands. Here are their six tips for ensuring the long-term health of our natural world:

1 Manage your dog

2 Pick up poop

3 Trash your trash

4 Leave it as you find it

5 Stick to the trail

6 Share our trails

Source: lnt.org

W inter can be frustrating for working on your fitness. The gym is crowded, snow and ice make streets slippery, trails aren't clear and the sun makes shorter appearances each day.

So pull on those running tights or bike shoes and head to Boulder's eastern trails, which get tons of sun exposure. (OK, one of these isn't east, but they all get sun.)

Check out bouldercolorado.gov/openspace for trail maps, info on closures and trail conditions.

Teller Lake

The pastoral trails around Teller Lake wander through open east county farmland. Going for distance? Connect to the East Boulder and White Rocks trails, which head into Gunbarrel. Dogs are not allowed north of Valmont Road, nor within 100 yards of Teller Lake.

Trailhead: The south Teller Farm trailhead sits one mile east of 75th on Arapahoe Road. The north Teller Farm trailhead is two miles east of 75th on Valmont.

Length: 1-3 miles, depending if you head north or south.

Boulder Valley Ranch

These wide-open prairie trails loop over rollers between the foothills and the Boulder Reservoir. For cyclists, it's easy to connect these trails to the roads (gravel and paved) north of Boulder. Dogs are allowed under voice and sight control.

Trailhead: One mile east of U.S. 36 on Longhorn Road

Length: 1-3 miles, depending on the route.

Wonderland Lake

Thanks to the lack of trees, the Wonderland Lake trails clear out quickly after a snow. This area is good for cycling, hiking or running, but it can get windy in the winter. Dogs must be on a leash.

Trailhead: 4201 N. Broadway

Length: 1-2 miles, depending on which trail you take; it's easy to add more miles by taking a second loop.

Marshall Mesa

This area gets plenty of sun and makes for a fun, easy mountain bike outing when other trails are snowed in. The hills can be icy, so be cautious. Dogs are allowed to be off leash under voice and sight command. People hike out here, too, but if you don't like bikes, this isn't recommended for bipedal folks.

Trailhead: Just east of the junction of Colo. 93 and Marshall Road

Length: 3.3-mile loop -- or more.

South Boulder Creek

The Cherryvale Trailhead is an especially good starting point for runs on the sunny South Boulder Creek Trail. Runners and hikers can connect to the western part of the trail, past Colo. 93 -- bikes can't. Dogs are prohibited south of South Boulder Road. The southern trails can get windy, so it's best to go on calm days.

Trailhead: 66 S. Cherryvale Rd. for Cherryvale, 0.5 miles north of Eldorado Springs Dr. on Hwy 93 for South Boulder Creek west trailhead

Length: 1-3 miles, depending on how adventurous you are.