Union Falls

Union Falls is distinctive because two creeks, Mountain Ash Creek and an unnamed tributary, converge and unite at the very brink of the falls before plunging over the cliff. This creates a unique "teepee" or "curtain" shape as the water fans out during its 250-265 foot descent. It's also the second-tallest major waterfall in Yellowstone, offering a remote and less crowded experience.

The hike to Union Falls is generally considered moderately difficult and long, typically 15 to 16 miles round trip with some elevation gain and river crossings. While rewarding, it's not ideal for beginners or very young children due to its length and challenging terrain. Families with older, experienced hikers may find it manageable.

Yellowstone National Park has strict regulations regarding pets on trails. Dogs are generally not allowed on hiking trails, boardwalks, or in the backcountry, including the Union Falls trail. They must be on a leash no longer than six feet and are only permitted in developed areas, such as roads, campgrounds, and within 100 feet of paved roads.

Access to the Union Falls trailhead is typically via Grassy Lake Road. This road often requires a high-clearance vehicle, especially earlier in the season or after heavy weather, and it is not open year-round. Parking is usually available at the trailhead, but spaces can be limited, particularly during peak season.

For day hiking to Union Falls, a specific permit is not required beyond the standard Yellowstone National Park entrance fee. However, if you plan to do any backcountry camping along the trail or in the Bechler region, a backcountry permit is mandatory and must be obtained in advance from the National Park Service.

While the intro mentions warmer months, to avoid the busiest times and ensure optimal trail conditions, late spring (late May/early June) or early fall (September) are often recommended. During these periods, Grassy Lake Road is typically open, river crossings might be less challenging than in peak summer, and the crowds are generally thinner than in July and August.

Winter access to Union Falls is extremely challenging and generally not recommended for most visitors. Grassy Lake Road is closed, making the approach much longer and requiring significant backcountry travel experience, including snowshoeing or cross-country skiing. Conditions can be severe, with deep snow, extreme cold, and avalanche risk. It is primarily for experienced winter adventurers.

Absolutely! A short side-hike from the main trail leads to Ouzel Pool (also known as Scout Pool), a geothermally heated swimming hole with its own smaller waterfall. This offers a unique opportunity for a warm soak in the wilderness and is a popular highlight for many hikers.

The Union Falls trail offers a true immersion into Yellowstone's backcountry, increasing your chances of wildlife sightings. Hikers frequently report seeing deer, elk, and various bird species. As with any remote area in Yellowstone, there's also a possibility of encountering larger mammals like bears, so carrying bear spray and knowing how to use it is essential.

The Union Falls area itself is very remote, with no immediate accommodations, cafes, or restaurants. The closest services would be near the Yellowstone South Entrance, such as Flagg Ranch, which offers lodging, dining, and a general store. For more options, you would need to travel further to towns like Jackson, Wyoming, or West Yellowstone, Montana.