Unless there’s an early snow, most of the trails should be accessible… just maybe not by chairlift There’s literally hundreds up hundreds of miles of trail in Summit County — check out the listings in our trail database, here: https://www.singletracks.com/Colorado-bike-trails_6.html?filterBy=%7Cloc:39.630278~-106.042778~25~Dillon%252C+CO
Also, plenty of bike shops in the various towns have large rental fleets that should be available. Summit County’s infrastructure is pretty well developed in that respect as well.
If you need specific trail recommendations, let us know what you’re looking for!