10 Idaho Swimming Holes To Cool Off At Before August Ends

Summer is already checking the clock, so those swims you keep postponing are officially running out of excuses.

Idaho knows how to cool August down with river beaches, mountain water, springs, and refreshing swimming spots worth chasing.

Some locations suit relaxed floating and family afternoons, while others appeal to adventurous swimmers seeking a livelier outing.

Surroundings vary just as much, keeping each stop distinct instead of turning the list into repeated versions of the same swim.

Water conditions can change, so checking current safety information before visiting remains important.

Grab the towel, pack something cold to drink, and use those remaining summer days before sweater weather starts winning the argument.

1. Dierkes Lake, Twin Falls

My jaw literally dropped the first time I rounded the corner and saw all that blue water. Basalt cliffs wrap around it like a natural stadium.

Dierkes Lake sits just minutes from downtown Twin Falls, tucked inside the larger Shoshone Falls park. The water stays cool and clear, even during the hottest stretch of August.

Cliff jumping is the headline act here. Ledges range from beginner-friendly hops to drops of more than 35 feet.

If leaping off rock is not your style, diving boards give you a steadier launch. A shallow kiddie pool area keeps the youngest swimmers happy and close.

Walking and running trails loop around the shoreline. They serve up wide views of the lake and the Snake River Canyon below.

Boulderers show up too, scrambling across the rock formations near the water. Bring climbing shoes if that sounds like your kind of fun.

Since Shoshone Falls is right next door, pair your swim with a look at the Niagara of the West. Late summer flows are lower, but the canyon views still deliver.

Arrive early on weekends, because parking fills quickly. Water shoes help on the rocky entry points.

Pack shade, since tree cover is limited on the sunniest slopes. Few swims start with a jump and end with a waterfall in the same afternoon.

2. Quinn’s Pond, Boise

Have you given any thought to how a capital city hides a glassy 22-acre swimming pond? Boise pulled it off, and locals treat it like a backyard.

Quinn’s Pond, officially Bernardine Quinn Riverside Park, sits right off the Boise River Greenbelt. Green lawns and the Boise Foothills frame the whole scene.

The surface stays calm almost all day. That makes it a favorite for paddleboarders, kayakers, and canoe paddlers of every skill level.

You can rent boards and kayaks on-site if hauling gear sounds like a hassle. Beginners often wobble through their first strokes here.

Swimmers stick to the shallower edges, where the water warms up nicely in August. The Greenbelt connection means you can bike in instead of hunting a parking space.

Esther Simplot Park sits next door and expands your flatwater options considerably. Together the two create a small chain of swimming and paddling areas.

Birdwatchers do well here as well. Herons, ducks, and geese cruise the shoreline throughout the warm months.

Summer brings yoga sessions on the grass and paddleboard races on the water. The atmosphere leans social without feeling crowded.

Go on a weekday evening for the softest light and the emptiest shoreline. Sunset over the foothills makes a strong argument for staying past dinner.

3. St. Anthony Sandbar, St Anthony

Just imagine a river beach that families have loved for more than sixty years. Grandparents here learned to swim in the same water their grandkids splash in now.

St. Anthony Sandbar sits along the Henry’s Fork of the Snake River. The setup is simple, sandy, and refreshingly old-fashioned.

A free waterslide sends riders straight into the current. A diving board handles anyone who prefers a clean vertical entry.

The beach itself is wide and soft, ideal for sandcastles or a long nap on a towel. A roped-off area keeps younger swimmers in calmer, shallower water.

Picnic tables sit within easy reach of the sand. Sandboxes give little ones something to do between swims.

There is no entrance fee, which makes an all-day outing easy on the wallet. Pack a cooler, a couple of tubes, and plan to stay.

Current does move here, so keep an eye on strong swimmers drifting downstream. Late August water tends to run pleasantly warm near the surface.

Shade is limited, so a pop-up canopy earns its keep. Mornings are quiet, afternoons buzz with local kids.

You will find this community favorite at 139 S 3rd E, St Anthony. Some swimming holes chase trends, and this one simply keeps doing what works.

4. Jump Creek Falls, Marsing

You could have knocked me over with a feather when sagebrush country opened into a green, dripping canyon. Desert one minute, waterfall the next.

Jump Creek Falls hides in the Owyhee Desert southwest of Marsing. A 60-foot cascade drops into a cold pool at the canyon floor.

The hike in runs roughly a quarter to half a mile. It follows a creek bed past willows, boulders, and surprisingly lush pockets of plants.

Expect some rock hopping along the way. Sturdy shoes beat flip-flops by a wide margin.

The pool beneath the falls stays bracingly cool through the hottest weeks. Standing under the spray is the whole reward.

Natural rock obstacles nearby draw scramblers and climbers. Take your time, since the stone gets slick where mist lands.

Picnic areas near the parking lot give you shaded spots to eat afterward. Raptors circle overhead, and photographers tend to linger for the canyon light.

Go early in the day, because there is little relief from the sun on the drive in. Carry plenty of drinking water, since none is available at the trailhead.

The last stretch of road is gravel and washboarded in spots. Drive it slowly and you will be fine.

Look for the falls at Jump Creek Falls, ID 83639, and pack out everything you bring in.

5. Baumgartner Hot Springs, Fairfield

Hot water and cold water side by side is a rare piece of luck. Soak, shiver, repeat.

Baumgartner Hot Springs sits deep in Sawtooth National Forest near Fairfield. The main pool measures about 15 by 20 feet and is built from concrete.

Mineral water arrives at roughly 110 degrees. The Forest Service drains, scrubs, and refills the pool daily, so it stays clean.

Wooden decking and benches ring the edges. You can dry off, warm up, and slide back in whenever you like.

A few steps away, the South Fork Boise River runs cold and quick. Alternating between the two is the whole point of coming here.

Anglers do well in the river, especially in the early morning. Bring a rod if fishing is part of your plan.

A quarter-mile interpretive nature trail loops through the pines. Signs explain the forest and geology in plain language.

The access road is long, so fill your gas tank before leaving town. Cell service disappears well before you arrive.

Campsites nearby make an overnight stay tempting. Nights get chilly even in August, which makes a late soak even better.

Find it at 102 1st Street, Fairfield, and give yourself an unhurried afternoon. Two water temperatures, one very satisfying day.

6. Fall Creek Falls, Swan Valley

You took the words right out of my mouth about waterfalls that empty straight into a big river. This one does exactly that.

Fall Creek Falls tumbles roughly 60 feet into the Snake River near Swan Valley. The multi-tiered curtain of water spreads across mossy rock.

Getting there takes almost no effort. A short walk from roadside parking puts you at the overlook.

Below the main cascade, natural pools form along the shoreline. Cooling off with that view is hard to beat.

Kayakers and canoe paddlers often approach from the water side. Fishing is solid in the calmer stretches nearby.

Wading lets you explore small islands and shallow channels. Watch your footing, since river rock shifts underfoot.

A large mossy cave sits at the base of the falls. Photographers love it, especially when morning light hits the spray.

Panoramic foothill views surround the whole area. Sunrise and sunset turn the water gold.

Parking is limited, so weekday mornings work best. The final approach road is unpaved and dusty in late summer.

Bring a towel and dry shoes for the ride home, because mist reaches farther than you expect. Few short walks pay off this dramatically.

7. Lucky Peak State Park (Sandy Point), Boise

I’m right there with you if calm, shallow water sounds better than any wave. Sometimes the simplest beach wins.

Sandy Point at Lucky Peak State Park sits at the base of Lucky Peak Dam outside Boise. The 34-acre site is built for lazy summer afternoons.

A protected cove keeps the water gentle and shallow far from shore. Little swimmers can wade a long way without trouble.

Two beach volleyball courts handle the competitive crowd. Water toys and floaties fill in the rest of the day.

Beyond the sand, cool grass and shady trees give you somewhere to escape the sun. Blankets and camp chairs both work well.

Restrooms, changing areas, and showers are all on-site. That combination makes packing simple.

Paddleboard rentals let you drift across the flat water. The dam wall behind you makes an unusual backdrop.

Water released from the dam runs cold, so the first few steps sting. You get used to it fast.

Weekends fill early, and the gate can close when parking runs out. Aim for a morning arrival or a weekday.

The address is 9723 ID-21, Boise, only a short drive from downtown. Easy access plus a real sandy beach is a tough combination to argue with.

8. Box Canyon Springs Preserve, Wendell

A dry desert rim can hide water the color of a swimming pool advertisement. The contrast is almost hard to believe.

Box Canyon Springs Preserve near Wendell belongs to Thousand Springs State Park. Its water ranks among the clearest in southern Idaho.

A moderate hike drops you into a basalt canyon. Sagebrush above gives way to thick green growth below.

A rushing stream follows the trail most of the way down. A roughly 20-foot waterfall signals that the main pool is close.

Because the pool is spring-fed and constantly flowing, the temperature stays genuinely cold. On a triple-digit afternoon that is the entire appeal.

Overlooks near the top serve up quick views without the descent. Longer routes include rails and ropes on the steeper sections.

Grippy shoes matter here, since loose rock is common. Take the climb back out slowly in the heat.

Carry more water than you think you need. Shade is patchy until you reach the canyon floor.

Wildlife sightings include birds nesting in the cliff walls. Bring binoculars if you like scanning the rim.

Geology fans will spend as much time studying the rock as swimming. A hidden canyon pool this vivid deserves a full morning.

9. Laird Park Campground, Harvard

Call me crazy, but an uncrowded river beach in North Idaho counts as hitting the jackpot. Quiet water is getting harder to find.

Laird Park Campground sits near Harvard along the Palouse River. Its sandy beach traces back to a Civilian Conservation Corps dam built in 1933.

Tall pine and cedar trees shade much of the shoreline. The setting stays cool even at midday.

Swimming here is mellow and shallow in most sections. Kids can splash while adults stretch out on the sand. Rainbow and brown trout live in the river. Anglers often work the pools upstream from the beach.

The park holds 31 campsites plus group picnic areas. Day trips and weekend stays both work well.

A half-mile interpretive trail winds through the forest. Signs point out trees and local history along the way.

Cell coverage is spotty, which honestly improves the experience. Download directions before you leave the highway.

Mosquitoes show up near dusk, so pack repellent. Firewood is worth bringing if you plan to camp.

Look for it at 1101 Palouse River Rd, Harvard, tucked in the timber country. This corner of the state rewards anyone willing to drive a little farther north.

10. Redfish Lake, Stanley

Sounds too good to be true, an alpine lake with sandy shores under jagged granite towers. Yet there it is.

Redfish Lake sits just south of Stanley, the largest lake in the Sawtooth National Recreation Area. Those peaks rise straight out of the far shoreline.

Glaciers carved this basin long ago. The water runs clear, cold, and startlingly blue on sunny mornings.

Beaches near the shore warm slightly in August, making swimming realistic. Kids wade while paddlers head for open water.

Hiking, camping, and water sports all center on the lake. Trails climb into the surrounding wilderness from several trailheads.

On the north shore, the seasonal lodge runs a marina and a cross-lake ferry. That boat ride saves hikers miles of shoreline walking.

The name comes from sockeye salmon that once returned in numbers that turned the water red. Their journey from the ocean remains one of the longest anywhere.

More than 300 mountain lakes dot the surrounding high country. Many require serious effort to reach, which makes this one a gift. Campsites book up fast, so plan well ahead. Nights turn cold at this elevation, even in late summer.

Bring layers, a camera, and patience for the crowded boat ramp. Idaho saves some of its finest scenery for the very end of swim season.