Oppdal is bordered by one municipality in Sør-Trøndelag (Rennebu to the northeast), three municipalities in Møre og Romsdal county (Surnadal on the north and Rindal and Sunndal to the west), two municipalities in Hedmark county (Tynset on the east and Folldal on the south), and one municipality in Oppland county (Dovre to the south).
European route E6 passes straight through the commercial center of Oppdal.[4]
The southeastern part of Trollheimen mountain range is located in the municipality. The municipality covers an area equal to the entire county of Vestfold. The administrative centre is at 545 meters above sea level. In 2001 its drinking water was named best in Norway.[6]
Most of Oppdal's area is mountainous, with large areas above the treeline. Storskrymten at nearly 2,000 m (6,600 ft) is the highest mountain in the county. In the valleys around creeks and the river, there are some spruce and pine woods; closer to the treeline, birches dominate. There are several lakes in the municipality, the most famous being Gjevilvatnet, a particularly scenic lake with hiking and cross-country skiing trails around.
Heather and alpine meadows provide grazing for sheep in the summer. 1,161 km² of the mountains has been held since time immemorial as a collective (almenning) by farmers in the area, giving them the right to hunt, fish, and rent cabins.




