Season calendar
Green River — Desolation and Gray Canyons by month
Best months, permit windows and published seasonal conditions in one view. Every band comes from this destination’s verified agency sources — months with nothing published say so.
October
- Autumn · September – October
- Moderate temperatures, stable lower flows and cottonwood color — many consider this the best window.
Permits
A BLM river permit is required year-round for Desolation and Gray Canyons. Peak-season launches (roughly May 1 – September 30) are allocated by lottery through Recreation.gov; off-season permits are available without the lottery.
Source: Recreation.gov — Desolation Gray permit · verified 2026-09-15
Itinerary wizard
Build your Green River — Desolation and Gray Canyons trip
Answer three questions and this builds a day-by-day frame from the published route, the agency's seasonal windows and this destination's verified packing and hazard notes.
Step 1 of 3