Here are the official closing dates for some of the more popular trails. Of course, any trail that is open yet wet or muddy should be left to dry out or freeze before riding.
WHAT IS CLOSED UNTIL NEXT SPRING/SUMMER:
Sky Mountain Park, North Rim, Seven Star: Seasonal wildlife closure in effect for all users Dec. 1 through May 15
Rio Grande Trail: Rock Bottom Ranch to Catherine Store segment is seasonally closed for all users Dec. 1, 5pm – April 30, 5pm.
Glassier Open Space: Seasonal closure in effect for all users Dec. 1 through May 15. – Please note: Glassier OS is closed after dark per the adopted management plan; plan your night rides to start up the hill at dusk so you can finish on Buckhorn and the Rio Grande with your lights turned on.
Crown / Prince Creek / Buckhorn: Seasonal closure in effect for bikes on most Crown BLM land Dec. 1 through April 15. An exception to this closure allows for bikes (fat bikes!) on lower Prince Creek trails (South Porcupine Ditch and below).
Red Hill: Elk Traverse + north side trails seasonal closure for all users is Dec. 1 through April 15.
Lorax Trail: Seasonal closure for bikes on Lorax area BLM routes Dec. 1 through April 15.
South Canyon: Coal Camp trail seasonal closure for all users is Dec. 1 through April 15.
New Castle: Seasonal closure for bikes on BLM routes north of N.C., Dec. 1 through April 15.
TRAILS THAT REMAIN OPEN THROUGHOUT WINTER (CONDITIONS PERMITTING)
Aspen Fat Bike Loop: Includes portions of the Aspen Golf Course, Marolt Open Space and Maroon Creek Trail linking the ARC to the Aspen Golf Course.
Rio Grande Trail: Full trail from Aspen to Glenwood Springs (Except for the two mile section between Rock Bottom Ranch and Catherine Store)
Red Hill: All “front side” trails south of Elk Traverse.
Prince Creek Below North Porcupine: Prince Creek Climbing Trail, Monte Carlo, Christmas Tree, Lower FOG.
Grandstaff Trail: Access by riding up Red Mountain Road in Glenwood Springs.
Lower New Castle Trails: Prendergast Hill, Medaris, Pub View, Salty Dalty & Jolley Trails
Of course, if weather should hit the valley before these dates causing muddy/wet conditions, please stay off trails until they dry out or freeze over.