Highlight • Waterfall
Union Falls
Hiking
5.0
(1)
Union Falls is a magnificent fan-type waterfall nestled in the remote southwestern corner of Yellowstone National Park, Wyoming. Situated on Mountain Ash Creek, a tributary of the Fall River, this natural monument stands at an elevation of approximately 2060 meters (6,760 feet) within the park's "Cascade Corner" or Bechler region. It is celebrated as Yellowstone's second-tallest major waterfall, plunging an impressive 250 to 265 feet. Its unique formation, where two creeks unite at the brink before fanning out over the cliff, gives it a distinctive "teepee" or "curtain" shape.
What truly captivates visitors to Union Falls is its secluded beauty and the profound sense of wilderness it offers. Unlike many of Yellowstone's more frequented attractions, this remote location provides a serene and less crowded experience, allowing for a deeper connection with nature. Hikers often rave about the rewarding journey through lush forests and the chance to witness the powerful, fanned waterfall in a tranquil setting. The opportunity for a warm soak in the geothermally heated Ouzel Pool, a short side-hike away, adds another unique and memorable dimension to the adventure.
Reaching Union Falls requires preparation for a challenging, long day hike, typically spanning 15 to 16 miles round trip with some elevation gain and river crossings. Access to the trailhead is usually via Grassy Lake Road, which may necessitate a high-clearance vehicle and is not open year-round. Visitors should be equipped with appropriate footwear for varied terrain, prepare for changing weather conditions, and be aware that backcountry camping options require a permit. This journey is an immersion into Yellowstone's backcountry, making the effort part of the overall experience.
The best time to visit Union Falls is generally during the warmer months when Grassy Lake Road is accessible and trail conditions are most favorable for hiking and backpacking. This period allows for enjoyment of the abundant rivers and streams, as well as opportunities for fishing and spotting wildlife. The area is particularly popular with hikers, backpackers, and equestrians seeking a true wilderness adventure away from the main tourist hubs.
The hike to Union Falls offers a rich tapestry of experiences, from traversing through temperate forests to encountering abundant berry patches and enjoying colorful fall foliage. Hikers frequently report wildlife sightings, adding to the thrill of exploring this quiet corner of Yellowstone. The feeling of accomplishment upon reaching the majestic waterfall, combined with the chance to relax in Ouzel Pool, creates standout moments that stay with visitors long after their trip.
For those eager to explore the diverse landscapes around Union Falls, a variety of trails and routes await. Whether you're interested in a challenging day hike or a multi-day backpacking trip, komoot offers numerous options to help you plan your visit. Discover detailed maps and community-contributed routes for hiking, trail running, and even equestrian adventures, ensuring you find the perfect path to experience the natural wonders of the Yellowstone Bechler region.
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Tips
May 10, 2023
Hiking
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Nearby routes
Best routes near Union Falls
2
hikers
12.5km
03:30
200m
320m
Embark on a moderate hike along the Union Falls via Mountain Ash Trail, a 7.8-mile (12.5 km) route that takes you through Yellowstone's wooded landscapes. You will gain 649 feet (198 metres) in elevation over approximately 3 hours and 29 minutes of walking. The path follows Mountain Ash Creek and the Falls River, leading you deeper into the park's natural beauty. Your journey culminates at Union Falls, a striking 250 to 265-foot fan-type waterfall where two distinct creeks converge. This trail offers a true backcountry experience, immersing you in the serene atmosphere of the wilderness.
Before you set out, be aware that accessing the trailhead for this route often requires driving on the remote and somewhat rough Grassy Lake Road, so plan your vehicle and travel time carefully. A significant part of this adventure involves a challenging ford of the Falls River. This crossing can be swift and reach knee-deep levels, particularly if you visit before mid-July. Always check current conditions and prepare for a wet crossing to ensure a safe and enjoyable trip.
This trail is situated in Yellowstone's unique "Cascade Corner," an area renowned for its abundance of streams and waterfalls. Beyond the impressive Union Falls, you can also discover the geothermally heated Scout Pool, a natural swimming hole. This warm pool offers a perfect opportunity for a refreshing dip and relaxation after your hike, adding a distinctive element to your backcountry exploration in the park.
4
hikers
24.9km
07:00
500m
500m
Hike the difficult 15.5-mile Union Falls Trail in Yellowstone National Park to experience remote backcountry and a majestic 260-foot waterfa
Details
Informations
Elevation 2,060 m
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Monday 1 June
13°C
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23 %
Additional weather tips
Max wind speed: 20.0 km/h
Frequently Asked Questions
What makes Union Falls unique compared to other waterfalls in Yellowstone?
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.
Is the hike to Union Falls suitable for beginners or families with young children?
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.
Are there any dog-friendly trails or regulations for pets near Union Falls?
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.
Where can I park to access the Union Falls trailhead, and do I need a high-clearance vehicle?
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.
Do I need a permit for day hiking or backcountry camping at Union Falls?
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.
What are the best months to visit Union Falls to avoid crowds and ensure good trail conditions?
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.
Is it possible to visit Union Falls during winter, and what are the conditions like?
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.
Are there any other natural features or landmarks near Union Falls worth visiting?
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.
What kind of wildlife might I encounter on the Union Falls trail?
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.
Are there any accommodations, cafes, or restaurants near the Union Falls area or the Yellowstone South Entrance?
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.