The GR 1 is a 121 km trail that starts in Nesles-la-Vallée, France and ends in Porte-Dauphine, France. The trail is considered to be easy to hike and has a total elevation gain of 1548m. Normally the trail takes 1 days to complete but can be finished in as little as 1 day.
The warmest months are June, July, and August and the coldest months are December, January, and February. The wettest months are December, January, and February and the driest months are March, April, and May.