Best Swimming Holes near Billings, MT

Billings sits at the edge of the Northern Rockies and the high plains of Big Sky Country — a location that gives swimmers surprising access to everything from wide, warm prairie rivers to cold, clear mountain lakes perched above the treeline. Summer here is short but vivid: wildflowers explode across canyon walls, osprey dive along the Yellowstone, and the water temps climb just enough for a rewarding dip before the season turns again.

What makes the Billings area special is the sheer variety. Within a two-hour drive you can go from splashing in a warm reservoir backed by towering rimrock to dipping into the icy emerald pools of the Bighorn Canyon. This is a region where the landscape does the heavy lifting — the swimming holes are just an excuse to get out and explore it.

That said, Montana's swim season is genuinely compressed. Most spots don't reach comfortable temperatures until late June, peak in July and August, and start cooling fast by mid-September. Plan accordingly, bring layers for the drive home, and don't skip the sunscreen — the high-altitude sun here bites harder than it looks.

TL;DR:

• Best overall destination: Yellowtail Reservoir / Bighorn Canyon for warm, calm water and dramatic canyon scenery
• Best urban option: Lake Elmo State Park — 5 minutes from downtown, lifeguards, sandy beach
• Most adventurous: Crystal Lake in the Beartooths — cold, remote, unforgettable
• Historical bonus swim: Pompeys Pillar National Monument on the Yellowstone River
• Peak season: late June through August; water temps vary widely by elevation

Top 5 Swimming Holes Near Billings

1. [[Listing: BIGHORN RIVER]] – The Bighorn River below Yellowtail Dam flows cold and crystal-clear through one of the most dramatic canyons in the American West. The put-in areas near Fort Smith offer calm stretches ideal for swimming, roughly 90 minutes south of Billings on US-313. The river runs a near-constant 54°F year-round below the dam — refreshing in summer, bracingly cold the rest of the time. Bring water shoes for the rocky bottom and plan a full day.

2. [[Listing: YELLOWTAIL RESERVOIR]] – Impounded behind Yellowtail Dam in Bighorn Canyon National Recreation Area, this reservoir offers the warmest and most accessible swimming in the region. The water is a deep, brilliant blue against buff-colored canyon walls, and the protected coves along the Afterbay area are perfect for families. About 85 miles south of Billings, it's worth the drive for the scenery alone. Boat-accessible swim spots deeper in the canyon reward those with a kayak or canoe.

3. [[Listing: POMPEYS PILLAR]] – This National Monument along the Yellowstone River, just 28 miles east of Billings, is famous for the William Clark signature carved into its sandstone face — but locals know the wide gravel bars and gentle riffles along the river are ideal for wading and swimming. The Yellowstone runs warm through summer in this stretch, making it one of the most approachable swim spots near the city. Park at the monument, walk the riverbank, and find your own gravel bar.

4. [[Listing: CRYSTAL LAKE]] – Tucked into the Beartooth Mountains about 90 miles southwest of Billings, Crystal Lake earns its name. Fed by snowmelt and ringed by limestone cliffs, the water is startlingly clear and genuinely cold — even in August it rarely climbs above 60°F. A developed campground and boat ramp serve the area, and the surrounding Beartooth-Absaroka Wilderness makes for phenomenal hiking. Go prepared: afternoon thunderstorms are common above 7,000 feet.

5. [[Listing: LAKE ELMO STATE PARK]] – If you want a quick, hassle-free swim without leaving the Billings metro, Lake Elmo delivers. This 64-acre urban lake in the Billings Heights neighborhood has a designated swim beach, seasonal lifeguards, and a grassy lawn for post-swim lounging. The water warms nicely by mid-summer since the lake is shallow, and the facilities — restrooms, picnic tables, a volleyball court — are well-maintained. Entrance fees are modest and it's a 10-minute drive from downtown.

When to Go

June: Water levels are high and cold from snowmelt. Lake Elmo starts warming first and is usually swimmable by mid-June. Rivers are powerful and fast — skip the open water, focus on calmer reservoirs.

July: Peak season across the board. Yellowtail Reservoir reaches comfortable temps in the 70s°F. Crystal Lake is still cold but rewarding. Pompeys Pillar's Yellowstone River bars are at their best. Crowds peak on weekends at Lake Elmo.

August: Often the sweetest month. Snowmelt has subsided, water levels drop, and exposed gravel bars on the Yellowstone multiply. Evenings cool off fast at elevation — bring a dry change of clothes and a warm layer.

September: The season winds down quickly. Lake Elmo closes its swim beach after Labor Day. Higher-elevation spots like Crystal Lake become cold and often windy. Bighorn Canyon and Pompeys Pillar remain pleasant into early September.

Safety & Access Notes

• River currents: The Bighorn below the dam and the Yellowstone near Pompeys Pillar are moving rivers. Avoid swimming in fast current, especially early season when snowmelt boosts flow.
• Water quality: Check Montana DEQ advisories before swimming in any standing water — algae blooms can develop in warm, shallow lakes by late summer.
• Weather: Afternoon thunderstorms are a daily threat in the Beartooths. Start hikes early and be off Crystal Lake's exposed shoreline by noon.
• Access fees: Bighorn Canyon NRA requires a $5/vehicle day pass. Lake Elmo State Park charges a small entry fee. Pompeys Pillar is a National Monument with a $10/vehicle fee.
• Cell service: Bighorn Canyon and Crystal Lake have minimal or no cell coverage. Download offline maps and let someone know your plans.

FAQs

How far are swimming holes from Billings?
Lake Elmo is less than 10 minutes from downtown. Pompeys Pillar is 28 miles east (about 30 minutes). Yellowtail Reservoir and Bighorn Canyon are 85–90 miles south (roughly 90 minutes). Crystal Lake is about 90 miles southwest, requiring a winding mountain road — budget 2 hours each way.

Is the water safe to swim in near Billings?
Generally yes, but conditions vary. Lake Elmo is monitored and lifeguarded during summer. Rivers like the Yellowstone and Bighorn are safe in calm stretches but respect the current. Always check for harmful algae bloom (HAB) advisories on warm lakes via Montana DEQ before swimming.

Do I need a permit for swimming holes near Billings?
No permits are required for swimming itself, but some areas charge vehicle entry fees: Bighorn Canyon NRA ($5), Pompeys Pillar National Monument ($10), and Lake Elmo State Park (small fee). The Yellowstone River gravel bars at Pompeys Pillar are free once inside the monument, or you can access public river access points for free.

What should I bring to a swimming hole near Billings?
Water shoes (rocky bottoms on most rivers), sun protection (high-altitude UV is intense), a dry bag for valuables, a warm layer for after the swim, and plenty of drinking water. For Bighorn Canyon and Crystal Lake, pack snacks and lunch — there are no services nearby.

Responsible Recreation

Montana's wild swimming spots depend on visitors treating them with care. Pack out every piece of trash — leave the gravel bars at Pompeys Pillar and the shores of Crystal Lake cleaner than you found them. Stay on established trails to avoid trampling the fragile vegetation around high-mountain lakes. Keep pets leashed in state parks and National Recreation Areas. Respect wildlife corridors, especially in Bighorn Canyon where bighorn sheep and mule deer use the canyon bottom to access water. And if you're camping near your swim spot, follow Leave No Trace principles strictly — fire restrictions are common in dry Montana summers.