Some Jeffco trails switch who can use them by the calendar date

Jefferson County’s open space parks share trails between hikers, mountain bikers, and horse riders, and a few of them manage that crowding with rules that change by the day. If you do not know the rule, you can drive to a trailhead and find your group is not allowed that day.

Apex Park, on the slope below Lookout Mountain, is the clearest example. On its designated trails, bikes are allowed on even calendar dates, like the 2nd and 4th, while hikers and horse riders have those same trails on odd dates, like the 1st and 3rd. So the same trail can be a fast downhill bike run one day and a quiet walk the next. Checking the date against the rule is the whole trick.

Mount Galbraith Park, near Golden, works differently. It is hiker-only across the park, with no bikes or horses, on steep and rocky trail. If you want a climb without dodging riders, that is the place.

Two rules apply across the system. Dogs are welcome but must stay leashed and under control, and you pack out their waste. And many parks have seasonal closures to protect wildlife or let muddy trails dry.

Trail-use days and closures can change, so confirm the current rule on the Jefferson County Open Space page for the specific park before you head out.