If you are in north central UT near price, come ride the trails here.
They are extremely technical and challenging, causing me to put my feet down or walk everytime.
Here is a link with very good descriptions: Price Area Mountain Bike Trails
Support PASS (Price Area Singletrack Society) by making a small donation to Fuzzy, the owner/manager of Bicycle works at 100 W 100 N.
You can ride still ride them now, as there isn't that much snow on them at the moment. They are all on Woodhill just on Price's northern border.
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Thread: Price, UT Singletrack Trails