Start at the Spring Creek Pass trailhead off Hwy 149 (10898') and climb two miles east on the Snow Mesa Trail. Super strong riders might be able to ride half of the uphill, it's steep, rocky, and at altitude. At the top you're on Snow Mesa, a nearly flat, yet still rolling, plateau across which the Colorado Trail rolls along at an altitude ranging from 12,250 to 12,420 feet elevation.
At times, you can see the trail itself for miles! Follow this for about five miles and you'll come to a subtle saddle: with large cliff bands emerging to the left and a low, flatter ridge on the right. There's an old, worn-out USFS sign here that most likely is warning you of the impending wilderness boundary. If you ride Snow Mesa as an out and back, follow the visible Skyline Trail to the left (not mapped as part of this trail) underneath rock bands for another mile or two before hitting the actual La Garita Wilderness boundary.
If you're not doing an out and back, you can choose to descend the Miner's Creek
trail from this point and complete the Snow Mesa to Miner's Creek
point-to-point Featured Ride.