NH Sled Atlas

Snowmobile trails with modeled snow for any day of the last two seasons. Drag the date, or press play.

Your sled

Map shading

On this day

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trail miles with a good base

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thin (6–12 in)

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deepest trail snow

Ride videos around this date

YouTube videos that name an NH riding town, matched by the date in the title, or else posted within two weeks after this day. Filled dots on the map have videos from around this date.

Lake ice, modeled

A guess from air temperature, not a measurement. It can't see springs, inlets, currents, pressure ridges or slush. Never use it to decide to go on the ice: check locally and drill.

Lake	Ice	Model says

Notes

Snow is NOAA's SNODAS model at about 1 km, one value per day at 06:00 UTC. It's a model fed by stations and satellites: good for "is there snow up there", not for one field. Trail colors use the thinnest quarter of each trail's samples, because the bare spot is what stops you.

Trails are the state GRANIT layer (snowmobile use) plus OpenStreetMap snowmobile routes where GRANIT has none, about miles of the roughly 7,000 in the club system. For the real network and today's grooming, use the official SledNH map.

Off-trail. In the White Mountain National Forest sleds may only use designated routes. Everywhere else is somebody's land: off-trail riding needs the landowner's permission.

Lake ice uses Stefan's law with a low coefficient (1.7 cm/√°C·day) and daily melt, on Open-Meteo daily mean temperatures. Built .

Sources: NOAA/NSIDC SNODAS · NH GRANIT · © OpenStreetMap contributors · Open-Meteo · basemap and relief © Esri (World Light/Dark Gray Canvas, World Hillshade) · state outline US Census.