Poison Flat Trail
Photo: Ken Lund from Reno, Nevada, USA, CC BY-SA 2.0 (via Wikimedia Commons)- 10.5 mi
- round trip
- 2,252 ft
- climb
- 7,991 ft
- high point
- Out and back
- route
Is Poison Flat Trail open right now?
Alert in the area
The Forest Service lists an alert for Modoc National Forest.
Forest Fire Restrictions 2026 have been lifted as of 09/27/2026
Agency alert covering Modoc National Forest · Order 09-26-01 · USFS · Modoc National Forest
As of · Source: USFS · Modoc National Forest. Agencies don't list every closure — check before you go.
Poison Flat Trail is a 10.5-mile out-and-back hike in the South Warner Wilderness, part of the Warner Mountain Ranger District of Modoc National Forest in California. The trail climbs from about 5,867 feet to 7,991 feet, a gain of 2,252 feet, and is rated hard. The Forest Service manages the land, and the trail is open year-round. The route is natural-surface and allows horses, but bikes are not permitted. That makes it a viable option for riders on horseback, though it is a long and steep climb for anyone heading out. The trail sits close to several other destinations. The Clear Lake Loop Trail and Mill Creek are each about 0.3 miles away, and Mill Creek Falls Trail is about half a mile off. Mill Creek Falls campground is about 0.6 miles away.
Keep exploring — more trails worth the drive
Photo: Ken Lund from Reno, Nevada, USA, CC BY-SA 2.0 (via Wikimedia Commons)Poison Flat Trail
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Photo: Ken Lund from Reno, Nevada, USA, CC BY-SA 2.0 (via Wikimedia Commons)Modoc Line Trail
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Photo: Ken Lund from Reno, Nevada, USA, CC BY-SA 2.0 (via Wikimedia Commons)Clear Lake Loop Trail
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Mill Creek Falls Trail
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Mill Creek North
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East Creek Trail
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East Creek Trail is an out-and-back route in California, 11.14 miles and 1662 feet of elevation gain.
