Last updated: February 25, 2026
Thing to Do
Grassy Lake Road
The Grassy Lake Road connects Flagg Ranch to Ashton, Idaho. Folllow the road from the John D. Rockefeller Jr. Memorial Parkway into adjoining US Forest Service land. Please use caution on this dirt road. High clearance vehicles are recommended, and the road is closed for grizzly bear migration until June 1. Sections of the road may open later depending on conditions.
Along the road are eight camp areas including 14 campsites. These designated campsites are free on a first-come, first served basis. Each camp area includes a vault toilet and bear boxes.
Along the road are eight camp areas including 14 campsites. These designated campsites are free on a first-come, first served basis. Each camp area includes a vault toilet and bear boxes.
Details
Duration
1-4 Hours
The Grassy Lake Road is a 36 mile gravel road.
Activity
Scenic Driving
Pets Allowed
Yes with Restrictions
Pets are allowed in campgrounds and along the road (must be on a leash of 6 feet or less) until the road enters Forest Service lands, then follow Forest Service guidelines.
Activity Fee
No
Accessing the road from north or south requires paying the park fee for Grand Teton or Yellowstone.
Location
Flagg Ranch
Grassy Lake Road is accessible from Flagg Ranch.
Reservations
No
Grassy Lake campsites are available on a first-come, first-served basis after June 1.
Season
Summer, Fall
Grassy Lake road opens June 1 and closes for snow in the winter. Grassy Lake road is not plowed during the winter.
Time of Day
Any Time
Accessibility Information
Use caution on this dirt road. High clearance vehicles are recommended, and the road is closed for grizzly bear migration until June 1. Sections of the road may open later depending on conditions.