Getting Oriented
Union Pass crosses the Continental Divide at the south end of the Absaroka country, where the Wind River, Gros Ventre, and Absaroka ranges nearly meet. A monument at the top marks the divide between the Wind River drainage, which flows east to the Mississippi, and the Green River drainage, which flows southwest to the Colorado. A short distance away, a triple divide sends water toward the Mississippi, the Columbia, and the Colorado. The road links Dubois, on U.S. 287, with Pinedale, on U.S. 189.
Trail Overview
From Dubois the road climbs steadily on pavement that soon gives way to graded dirt and gravel. The middle of the route runs across open subalpine meadow near 9,000 feet, then descends through forest toward the Green River basin and Pinedale. Most of it suits a high-clearance vehicle; sections are rough and washboarded, and the surface stays soft and wet where snow lingers into summer. Plan about four hours one way without stops, and treat the crossing as a remote drive with no services between the two highways.
Points of Interest
- The divide monument. A marker at the pass commemorating the crossing and the trappers and explorers who used it.
- The triple divide. Near the pass, the drainage divides send water toward three of the continent's major river systems.
- High meadows and peak views. The open country at the top opens long views to the Wind River, Teton, and Absaroka ranges.
Where to Camp
Both national forests allow dispersed camping along the route, and there are developed Forest Service campgrounds in the Wind River and Green River drainages near each end. There are no services on the pass itself. Camp on durable ground, pack out everything, and store food against bears, since this is grizzly country.
Tips for a Safe and Enjoyable Trip
- Drive it in summer. The pass is snowbound and gated for most of the year, and even in early summer drifts can block the high meadows.
- Carry recovery gear and a full tank. There is no fuel, water, or cell signal between Dubois and Pinedale.
- Watch the weather. Afternoon thunderstorms are common at altitude and can turn the dirt greasy fast.
- Store food and scented items properly. The route runs through grizzly habitat.
- Carry a paper map or an offline track; junctions with logging and ranch roads can be confusing.
Fuel and Water
Dubois to the east and Pinedale to the west are the last fuel, water, and supplies. There is nothing in between, so start with a full tank and carry your own water.
Nearby
Dubois sits below the Absaroka Range on the way to Togwotee Pass and Grand Teton National Park. Pinedale anchors the western Wind River Range and the Green River lakes. Both make good staging towns for longer trips in the region.
