McKinney Falls State Park: The Day-Pass Trick That Saves You a Wasted Drive

McKinney Falls State Park sits inside Austin's city limits, and its day passes are already selling out most Saturdays this summer. According to ATX Things analysis, today's actual high in Austin, Texas is a relatively mild 99°F — nothing like the 107°F spike forecast for Monday — which makes this the better day to make the drive, provided you buy your ticket before you leave the house.

What's Actually at McKinney Falls Right Now?

McKinney Falls State Park is a 641-acre Texas state park at 5808 McKinney Falls Parkway in southeast Austin, about 13 miles from the Capitol, where Onion Creek drops over two sets of limestone ledges into wide, shallow swimming pools. It's one of the only state parks you can reach without leaving the city, which is exactly why it fills up.

The park is open daily, gate hours 8 a.m. to 10 p.m., with the entrance office staffed 8 a.m. to 4:15 p.m. Entry is $6 per person for anyone 13 and older; kids 12 and under get in free. Onion Creek itself can rise fast after rain upstream, so conditions change day to day — more on that below.

Is Onion Creek Actually Swimmable Today?

According to the USGS gauge at US 183 right by the park (site 08159000), Onion Creek was running at just 0.92 cubic feet per second early this morning — barely a trickle by the creek's standards, and well below the surge it sees after a hard rain. That means today is a calm, wading-depth day rather than a dramatic-waterfall day: the limestone ledges at the Upper and Lower Falls will be more "step over the rocks" than "swim under a cascade." It's a different scene from the Barton Creek Greenbelt during last week's heat wave, where the flow dropped to zero — Onion Creek still has some water moving through it today.

The park bans a specific list of things in the Upper and Lower Falls swimming areas: no food or snacks, no alcohol or glass, no coolers or ice chests, no pets in the water, no speakers or music, and no frisbees, footballs, or other hard balls. Dogs are welcome on leash elsewhere in the park, just not in the falls pools — worth knowing given this week's dog-heat warnings for Lady Bird Lake. Texas also has an active statewide screwworm alert as of June 2026 — check any pet for unusual wounds after time outdoors and call a vet if you see anything, per Texas Parks and Wildlife's posted notice.

How Do You Actually Get In Without Getting Turned Away?

There's no walk-up guarantee on a Saturday in August. If you're bringing a group, reserve now rather than after breakfast — same-day availability on a hot weekend can disappear by mid-morning.

Which Trail Should You Actually Hike?

The park has close to nine miles of trails, and most are open to both hikers and bikers. Here's what's actually there right now:

If you want to stay dry, stick to the Rock Shelter Trail, the Onion Creek Hike and Bike Trail, or the Picnic Trail — the Homestead and Flint Rock trails both require crossing at the Lower Falls, which TPWD flags as a "use extreme caution, you may get your feet wet" crossing even in low flow.

What Locals Should Know

• Book the day pass first. It's the single most common reason people get turned away at the gate on a weekend.
• Today (99°F) beats Monday (107°F). If your weekend is flexible, this is the cooler window before the next heat spike.
• Bring cash for nothing — it's card or online only for the day pass, and TPWD recommends buying ahead regardless.
• Skip the cooler at the falls. Coolers, glass, and alcohol are banned specifically in the Upper and Lower Falls swim areas — pack a cooler for the picnic tables instead.
• The Williamson Creek Overlook Trail is closed. Don't plan a route around it until the park lifts the repair notice.

FAQ

Is McKinney Falls State Park open today? Yes. The park is open daily, gate hours 8 a.m. to 10 p.m., with the entrance office open 8 a.m. to 4:15 p.m. Call (512) 243-1643 for same-day updates.

How much does it cost to get into McKinney Falls? $6 per person for visitors 13 and older; children 12 and under are free. Texas State Parks Pass holders ($70/year) get in free.

Do I need a reservation to visit McKinney Falls? Not technically, but the park's own alert page warns that day passes "sell out every weekend and holiday." Reserving online in advance is the only way to guarantee entry on a Saturday.

Can I bring my dog to McKinney Falls? Dogs are allowed on leash throughout most of the park, but pets are not permitted in the water at the Upper and Lower Falls swimming areas.

Is Onion Creek running high or low right now? As of early this morning, the USGS gauge at US 183 near the park read 0.92 cubic feet per second — a low, calm flow. Onion Creek can rise quickly after rain, so check with the park if there's been recent upstream rainfall.

McKinney Falls doesn't get the crowds — or the headlines — that Barton Springs Pool and the Greenbelt's Twin and Sculpture Falls do, which is exactly the point if you're trying to avoid a two-hour parking hunt this weekend. Check more things to do around Austin if the day pass sells out before you get one. We're watching whether the Williamson Creek Overlook Trail reopens before the next cool front — follow @austintexasthings for the update.