If you're just after a workout, try any one of the trailheads to get up on the Mesa trail in that runs just west of Boulder. Even an little snow allows you to tour, but it takes several storms to even start covering up the rocks off the trails.
From the top of Eldora there are some options, but you need to know what to avoid to be safe. Good touring in the valley behind, but it is still thin off the trail.
Dan do you have a split?
(seven two 0)-298-2242