Lava Hot Springs to Pinedale: Idaho-Wyoming Road Trip

Leaving Lava Hot Springs (42.6199°N, 112.0144°W), you immediately climb the Portneuf River Valley, where exposed volcanic rhyolite from the Yellowstone hotspot's past eruptions contrasts with the limestone of the Caribou Range. This route—US-30 west to I-15 north, then US-26 east through Idaho Falls and Swan Valley, crossing into Wyoming at Alpine Junction, and finally US-191 north to Pinedale—spans 188 miles and roughly 3.5 to 4 hours of driving time without stops. The section from Swan Valley to Alpine follows the Snake River's canyon, carved through ancient basalt flows. Notable: the original Lava Hot Springs bathhouse, built in 1927, is listed on the National Register of Historic Places.

Fuel prices along US-26 tend to be higher in smaller towns; fill up in Idaho Falls (average $3.20/gal as of 2025) before heading east. The route is mostly two-lane highway; be prepared for reduced speeds on mountain passes like Salt River Pass (elevation 7,605 ft) and Teton Pass (not on route but visible). Road conditions are generally good year-round, but snow tires are recommended from November to March.

• I-15 between Lava Hot Springs and Idaho Falls has a 75 mph speed limit;
• US-26 east of Idaho Falls is mostly 65 mph except through towns;
• US-191 north of Alpine (toward Jackson) is a scenic byway with narrow shoulders;
• No toll roads on this route.

Weather patterns vary sharply: Lava Hot Springs sees 10 inches of annual precipitation, while Pinedale averages 160 inches of snowfall, making summer ideal for travel. Winter driving can be treacherous, especially over Salt River Pass (US-26) and in the Greys River Canyon (US-89). Check forecasts before departure; the Wind River Range acts as a weather barrier, creating a rain shadow effect on the Pinedale side.

The route has several rest areas: at milepost 54 on US-26 near Irwin (has picnic tables), and at milepost 98 on US-26 near Bondurant (with vault toilets). For fatigue management, plan to stop every 2 hours or 100 miles; the towns of Idaho Falls (Bishop's Cafe, 1075 W Broadway St) and Alpine (Alpine Country Store, 4390 US-89) offer quick refueling breaks.

For families, Idaho Falls offers the Family Fun Center (4986 N. Rodeo Dr) with mini-golf; in Pinedale, the Pinedale Aquatic Center (150 S Sublette Ave) has a waterslide. Pet-friendly stops: The Hogsback trail near Idaho Falls (on US-26) offers dog-friendly hiking, and many motels in Pinedale, like the Log Cabin Motel (49 W Pine St), accept pets.

The route crosses the Caribou-Targhee National Forest, home to the best stops and hidden gems between cities. Near Swan Valley, the Palisades Reservoir offers water recreation; in Alpine, the Greys River Road leads to the Wyoming Range—a less-traveled alternative. The area around Pinedale is the gateway to the Bridger-Teton National Forest and the Wind River Range, which contains one of the world's largest concentrations of glaciers (56 named glaciers).

Local commerce centers on agriculture and tourism. In Idaho Falls, the Idaho Falls Farmers Market (Saturday mornings, May-October) features local produce and crafts. In Pinedale, the Museum of the Mountain Man (307-367-4101) chronicles the fur trade era; the town was named after mountain man John Pinedale. The Wind River Fly Shop (307-367-2980) offers guided float trips on the Green River.