Mt Jefferson is perhaps the most difficult of the Presidentials to climb by winter. The summit ridge is acquired from the west on the Jewel Trail, which departs near the base of the Mt Washington rack railroad. At approximately 4,500 feet exposure to weather and avalanche risk increases considerably as the route breaks above treeline. An undulating ridge traverse runs out the rest of the distance to the summit. Views from the top can be spectacular provided there is visibility to enjoy them. Care must be taken on the descent to find the Jewel Trail, not always an easy task; placing wands would not be unwise. It is extremely important to check and heed weather reports and be mindful of avalanche conditions when traveling above treeline on The Presidential Range as this area experiences some of the worst weather in the U.S. and the highest winds on earth; visibility is often limited. Snowshoes, crampons, ice axe and avalanche safety equipment are necessary for this outing.