We indicate seasonal routes whenever our agency data denotes them. On the MapViewer, season routes are indicated in the Route Detail popup window that is activated when you click on a route. The GPS Map for Garmin GPS units indicates season routes in the route name that attaches to the line. Season routes are also indicated within the meta data of the GPX and KML route files downloaded to your computer.
Seasonal restrictions are indicated on trail signs. Therefore, ALWAYS follow the signs and conditions on-the-ground, even if they are different than what is depicted by the OwlsheadGPS Project.