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COVID-19 Status & Maps
Daily status of the COVID-19 pandemic and its relationship to the trails.

Printed Maps & App
Stay found. Stay informead. Our premium printed topographic maps and matching app for a once in a lifetime adventure

OnLine Data Books
Free online data books for your favorite trail, distances, elevation, climate, way points, terrain & fauna

Google Maps
GPS aware Google maps, your location, topo, hybrid, satellite, trail track, way points, road, weather/snow overlays

Snow Conditions
Get the lastest snow conditions for your favorite trail. Quantity, coverage, SNODAS, MODIS, historical and multi-year comparisons

Trip Planners
Create an extensive hike plan easily configurable to your hiking style. Distances, days, resupply, access points, etc

Complete Gear Lists
Hundreds of complete gear lists by those that walked the walk.

Elevations Profiles
The big picture. Single elevation profile of your favorite trail.

Journal Tools
Search for a journal, create a journal, add/edit an entry, configure your journal, EMail updates, integrated Google trail map, PLB locations and more

Wall Maps
Print out your favorite trail to 6 feet high. Elevation chart and resupply locations.

Postholer Forum
Source for trail and site information or just talk about your favorite trail

Appalachian Trail Snow Report

COVID-19 Status

The Appalachian Trail snow report is designed to aid hikers in determining the best time to head into the mountains based on snow conditions. Each hikers skill-set and comfort level with these conditions will differ.

The Appalachian Trail snow report uses SNODAS modeled snow data and MODIS reflectivity data. SNODAS gives us a good idea about the quantity of frozen water sitting on the ground, denoted by SWE (Snow Water Equivalence) in inches. Coverage is often poorly represented by SNODAS where snow cover is thin. The 8 day MODIS data, without regard for quantity, shows us what areas were snow covered at some point over the last 8 days. Cloud cover and darkness adversely affects MODIS detection significantly, hence we use the 8 day as opposed to the single day coverage. This is the only combined MODIS/SNODAS AT snow map on the internet.

Trail snow is not snow pack. The Postholer snow page focuses on snow on or near the trail, at trail elevation, not on snow condtions thousands of feet lower/higher and miles away from the trail. Ski resort snow reports and snow pack charts are a very poor representation of trail snow conditions.

SNODAS SWE, Entire Trail

Appalachian Trail Snow Conditions, current SWE by mile
AT Maps

Appalachian Trail
topographic maps

SNODAS/MODIS, Gorham NH to Mt Katahdin ME

Appalachian Trail Snow SNODAS/MODIS, AT Gorham NH to Mt Katahdin ME
View SNODAS and/or MODIS overlays on Postholer Google Map. Last SNODAS update was Mar 28, 2020. Last MODIS 8 day was Mar 13, 2020 to Mar 21, 2020. MODIS: No Data, Snow cover.

SNODAS SWE, AT Gorham NH to Mt Katahdin ME

Appalachian Trail Snow Conditions, current by mile
Appalachian Trail Snow Conditions, current/extreme years
Appalachian Trail Snow Conditions 2004 to current

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