Twin Falls sits on the rim of a canyon most people driving I-84 never notice until they are on the bridge over it. The Snake River Canyon is around 500 feet deep here, and effectively everything worth doing in town happens either on its rim or down inside it.
The single most useful thing to know about things to do in Twin Falls, Idaho is a timing problem that most guides skip: the waterfall the town is named for is seasonal, and if you show up in August you may find a cliff with almost nothing coming over it. Everything below is written around that.
Shoshone Falls, and when it actually runs
Shoshone Falls is 212 feet, which is about 45 feet higher than Niagara, and in a good spring it carries over 12,000 cubic feet per second. In an exceptional year it goes past 20,000.
Then the irrigation season starts. Water is diverted upstream through the summer, and by late summer and into fall the flow can drop to a few hundred cubic feet per second or less. In September and October the falls often look close to dry rock.
April is the most reliable month. Snowmelt out of the Rockies puts the river at its seasonal peak, and that is the version of the falls that appears in every photograph you have seen. May is usually still good. If you are coming in August, plan the trip around the canyon rather than the waterfall and treat any water as a bonus. There is a per-vehicle fee at Shoshone Falls Park during the paid season, which runs roughly from late March through September, so check the current dates and rate with the city before you go.
Walk or ride the Snake River Canyon Rim Trail
About 12.3 miles of paved path along the canyon edge, and the best single thing to do here regardless of season. It links the falls, the Perrine Bridge and Centennial Waterfront Park, and it works for walking, running, road bikes and skates.
You do not have to do all of it. The section either side of the Perrine Bridge gives you the bridge, the canyon and the golf course far below in a couple of miles.
Watch people jump off the Perrine Bridge
The Perrine Bridge is 486 feet above the Snake River and it is the only bridge in the United States where BASE jumping is legal every day of the year with no permit required. It has been that way since the early 1990s.
This means that on most decent-weather days you can stand at the visitor center on the south rim and watch people step off. There is a viewing area and a path down toward the landing zone. It costs nothing and it is the most unusual free thing in southern Idaho.
Get down into the canyon at Centennial Waterfront Park
The road down to Centennial Waterfront Park is how you reach river level. Kayak and canoe rentals, guided boat tours, docks and picnic space, and the launch point for the paddle upstream to Pillar Falls.
Pillar Falls is a set of rhyolite towers and drops in the middle of the river, roughly a mile and a half upstream. Most people get there by kayak or paddleboard. There is a walking route down from the rim, but it is steep, loose, and worth taking seriously in proper shoes.
Perrine Coulee Falls
A tall, thin falls dropping off the canyon wall right beside Canyon Springs Road on the way down into the canyon. It runs on spring water rather than the Snake, so it holds up better through summer than Shoshone does. There is a pullout and a short path.
Dierkes Lake
Just past the Shoshone Falls entrance. A lifeguarded swimming area through the summer, usually June to August, plus an easy 1.7-mile loop trail with some stairs and modest climbing. This is where locals go on a hot afternoon, and it is the best answer to a August visit when the falls are low.
Auger Falls
West of town, a set of trails through the canyon bottom around Auger Falls with mountain biking, running and walking. Less polished than the rim trail, and quieter for it.
Day trips from Twin Falls
The Thousand Springs area northwest of town is where the Snake River Plain aquifer comes straight out of the canyon wall, and Box Canyon, Ritter Island and Malad Gorge are all within an hour. Balanced Rock, a 40-foot rock on a very small base, is southwest near Castleford. City of Rocks, which is the serious rock climbing destination in this part of the state, is closer to two hours southeast.
When to go
Late April through May is the best window and it is not close. Full waterfall, green canyon, and temperatures that make a 12-mile rim walk pleasant. June is still good. July and August are hot and the falls are fading, so the canyon, the lake and the river carry the trip. September and October give you clear weather, empty trails and a nearly dry Shoshone Falls, which is a fine trade if you know it going in.
How many days do you need?
One full day covers Shoshone Falls, the rim trail near the bridge and Dierkes Lake. Two days lets you get on the water to Pillar Falls and still do the rim properly. Three if you want to add Thousand Springs or City of Rocks, which are trips in their own right.
Things to Do in Twin Falls, Idaho FAQs
April. Snowmelt from the Rockies puts the Snake River at its seasonal peak, and flows can exceed 12,000 cubic feet per second. May is usually still strong. By late summer, irrigation diversions upstream can cut the flow to a few hundred cubic feet per second, and the falls can look almost dry.
Yes, by about 45 feet. Shoshone Falls drops 212 feet. It is far narrower than Niagara and carries much less water, so taller does not mean bigger.
Legally, yes. The Perrine Bridge is the only bridge in the United States where BASE jumping is permitted year round without a permit. That is a legal fact, not a suggestion. It is a 486-foot jump and people die doing it. Watching from the rim is free and requires nothing.
About 12.3 miles, paved, running along the canyon edge and linking Shoshone Falls, the Perrine Bridge and Centennial Waterfront Park. You can pick up any section of it.
For a few hours, yes, and it is right off I-84. The Perrine Bridge visitor center is minutes from the interstate and gives you the canyon, the bridge and often a jumper without paying anything or walking far.
