First off they aren't going to drop one where it would seriously effect you if you are 20 miles out.
The population base isnt dense enough to bother dropping one in the middle of nowhere. You cant sled in New York, anywhere up and down the West coast, St Louis, Kansas City, Denver(maybe).
These population centers are the prime targets for an EMP bomb. Effect as many people as possible. Dont piss em off and bring the wrath of the US by dropping a bomb on some poor sledder in the middle of nowhere.
Honestly with the disruption that that snow and the terrain we ride in causes to radio and cell signals, the EMP hit wont hurt you, the blast would have to knock you off the sled before I would worry about it.
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Emp's are detonated above the earth in the air... The range of wipeout covers hundreds and hundreds of miles.... Very interesting thought though