Single track suggestions :

Montrose/Delta. Flat Top OHV and Peach Valley area east of town. Drycreek west of town. These are my winter areas.
Fruita ride Rabbit Valley in to West Water Ut. My early spring /winter area.
Taylor Park west of BV. This is a must do.Still has some snow.
Granby area Stillwater pass, also called Rand.
Wolcott just north of I-70 on hwy131 . Turn left on Horse something road like MM 2. Another area north of here in McCoy at MM22. Melted
Breckenridge head out Tiger Road and go for miles.Still has snow.Many miles above 12k.
Steamboat above Steamboat lake big Red Park has good riding. Creek crossing are still very high.
Rico near Telluride. Expert level. It is melted.
Salida/Rainbow Tr. Melted.
Pitkin/Sargents is melted out another must do .
BV. Ruby Mtn.
I have been clearing a lot of wood riding lately. it is a good idea to carry a saw above 10k feet still if you do not already know.Excellent riding in Colorado most are not like the fun FAST riding in Woodland Park.Go high and beat the heat.

.