Rainbow Falls is a 55-foot waterfall on Fall River in Teton County, Wyoming, in the Middle Rockies region. It lies about 28.6 miles east of Ashton and roughly 74.1 miles northeast of Idaho Falls as the crow flies.
At 55 feet it is on the modest side for Wyoming, where the typical waterfall with a recorded height stands around 60 feet; it ranks 118th of 230. By form it is a segmented waterfall, splitting into two or more separate streams as it falls.
The Middle Rockies are high, glaciated mountain ranges with alpine peaks, subalpine fir and spruce forest, lodgepole pine and grassy intermontane valleys. Snowmelt streams cascade down glacial valleys and canyon walls. Fall River carries 11 recorded waterfalls; the biggest of them reaches 140 feet.
Teton County holds 121 recorded waterfalls, and several are close by. Terraced Falls, a 140-foot tiered waterfall, is under a mile away. Cascade Acres, a 30-foot cascade waterfall, is about 1.2 miles away. Pothole Cascades, a 40-foot cascade waterfall, is about 1.5 miles away.
Rainbow Falls is located at 44.1417° N, 110.8795° W. The listing is based on the World Waterfall Database, one of the sources compiled by the U.S. Geological Survey in its inventory of waterfalls and rapids of the conterminous United States. The creek name is confirmed against the federal Geographic Names Information System. The position was verified on aerial imagery. Details on trails, parking and access have not been documented for this waterfall yet.