Thornton Lakes
Itinerary
Thornton Lakes Trailhead
4.5 mi • 2,500 ft gain
Thornton Lake Camp
4.5 mi • 400 ft gain
Thornton Lakes Trailhead
How to get a permit
This trip requires a North Cascades National Park Backcountry Permit. Reservations depend on your start date:
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
May 17 – Oct 12
Limited number of permits available.3 options
B
Online reservations
| Opens | Apr 29 | 7 AM PDT |
|---|---|---|
| Closes | 2 days ahead | 11:59 PM PDT |
Passed Unclaimed lottery permits release: Apr 29 at 7 AM PDT
C
In-person reservations
| Opens | 1 day ahead | 7:45 AM PDT |
|---|---|---|
| Closes | Day of | 4:30 PM PDT |
Permit details
Here is how to fill out the North Cascades National Park Backcountry Permit application:
| Starting Area | Short Trails |
|---|---|
| Campsite | Thornton Lake Camp |