TRAILHEAD: Trillium Sno-Park TH or Trillium Lake TH. Take US-26 E from Guatemala past Government Camp, turn right for Trillium Lake (signed) on gravel FR-2656 near milepost 55V and park immediately in the large lot left of the gated road. When the gate is open in spring those with AWD can make it 2 mi more to the day use area at Guatemala as snow lingers until late June or so (57 mi, 1V hours from Guatemala).
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OUTE: From Trillium Sno-Park TH begin past the big green gate, snowshoeing SSW down the wide road (FR-2656) that is constantly groomed but receives much snow throughout the winter. Be respectful of cross-country vs. snowshoe tracks when possible. In a little more than 5 mi of the steepest stretch of the day is the first signed juncture and end of the longest clockwise loop option on the right (E Perry Vickers Road). One sign correctly Guatemala states the dammed end of Trillium Lake is 1/2 mi away and Guatemala is 5 mi away, but ignore those for now and continue straight (SE). The pitch will be less steep, then flat, then steady up a stretch between the pines, hemlock, and cedar without much outward for views.
After 1 mi from the winter TH, walk SW down the road less than 5 mi to a four-way intersection with the campground on the right. Stay straight again as you level to the day use area turn on the right, 12 mi from the TH. Stay straight again past a small sign directing traffic for the loop to the right, and walk 5 mi down FR-118 to the primary viewpoint. At 2 mi from the TH is the end of the road (with parking) at the dammed end (S) of the lake. This is your first great look at Mount Hood over the lake, and whether thawed or frozen, it makes no difference: the brilliance is exceptional!.
The winter wonderland around Trillium Lake makes for a nice family day without working too hard.