Acorn Lake
- 3.3 mi
- round trip
- 1,483 ft
- climb
- 6,054 ft
- high point
- Out and back
- route
- Jul–Sep
- best months
Is Acorn Lake open right now?
Alert in the area
The Forest Service lists an alert for Lolo National Forest.
East Fork Big Creek Road & Trail Closure- Superior Ranger District
Agency alert covering Lolo National Forest · Order 26-003- · USFS · Lolo National Forest
As of · Source: USFS · Lolo National Forest. Agencies don't list every closure — check before you go.
Acorn Lake is a moderate hike of about 3.3 miles on the Plains/Thompson Falls Ranger District of Lolo National Forest in western Montana, managed by the Forest Service. The trail is an out-and-back with a one-way climb of about 1,480 feet, from a low point of roughly 4,530 feet to a high of about 6,050 feet. Summer is the most comfortable time to go. Typical averages from a nearby weather station at a similar elevation show July and August highs around 70°F with only about six wet days a month, while winter highs stay near 28°F. The trail is natural-surface and allows both horses and bikes. Nearby options include Dee Creek, about 1.9 miles away, and Sacajawea Peak, about 2.5 miles away. For an overnight stay, Gold Rush Campground is about 8.9 miles off, and Twelvemile Creek offers canoeing about 7.7 miles away.
Best time to go · Jul–Sep
Best time to visit Acorn Lake
Best months: July–September. Best months have typical highs of 55–85 °F, lows of 30 °F or warmer (32 °F where the station doesn't record snow), at most one snowy day and no more than 12 wet days.
Jan
28° / 19°
19 wet
Feb
28° / 19°
17 wet
Mar
34° / 22°
19 wet
Apr
40° / 27°
17 wet
May
50° / 36°
15 wet
Jun
58° / 42°
13 wet
Jul
70° / 52°
6 wet
Aug
69° / 51°
6 wet
Sep
59° / 44°
8 wet
Oct
44° / 32°
13 wet
Nov
32° / 23°
17 wet
Dec
27° / 18°
18 wet
Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Mullan Pass Vor/Dme, ID, 24.1 mi away at 6,028 ft. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.
Keep exploring — more trails worth the drive
Photo: Forest Service - Northern Region, Public Domain Mark (via Flickr)Big Hole Lookout
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Flat Rock Ridge
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Sacajawea Peak
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CHERRY CREEK
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KOO KOO SINT RIDGE
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WEST FORK SWAMP CREEK
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