The short answer: plan for 5-7 hours total from the time you leave your house until you're back. The float itself is 2.5-4 hours depending on the river, but you need to account for driving, shuttle buses, check-in, and getting organized. Here's exactly how long each river takes, on the water and total.
Float Times at a Glance
| River | Float Time | Total Trip Time | Best For |
|---|---|---|---|
| San Marcos River | 3-4 hours | 5.5-7 hrs (from Austin) | Standard full-day float |
| Comal River | 2.5-3 hours | 5-6 hrs (from Austin) | Shorter float, families |
| Guadalupe — Horseshoe Loop | 45 min per lap | As long as you want | Repeat laps, all-day fun |
| Guadalupe — Long Float | 3-4 hours | 5.5-7 hrs (from Austin) | Scenic, less crowded |
| Blanco River | 3-4 hours | 5-6 hrs (from Austin) | DIY, quiet escape |
Total trip time includes drive time from central Austin (~45-60 min each way), shuttle bus to/from the put-in point, check-in, and the float itself. If you're driving directly to the river (not using a guided shuttle from Austin), subtract about 1-1.5 hours.
San Marcos River: 3-4 Hours on the Water
The San Marcos River is the most popular tubing river near Austin, and the float covers roughly 3-4 miles depending on which outfitter you use. At a lazy 1-2 mph current, that translates to 3-4 hours on the water.
The total trip from Austin looks like this: 45 min drive to San Marcos → 15 min check-in → 30 min shuttle to put-in → 3-4 hrs floating → 15 min shuttle back → 45 min drive home = ~6-7 hours total. For a guided trip departing from Austin, the outfitter handles the driving. You just show up and ride the bus.
Comal River: 2.5-3 Hours on the Water
The Comal River is the shortest of the three major floats, about 2.5 miles from the put-in at Landa Park to the take-out near Hinman Island. At 2.5-3 hours, it's ideal for families with young kids or groups that want to combine tubing with other New Braunfels activities (like exploring Gruene Historic District).
Total trip from Austin: approximately 5-6 hours. The drive to New Braunfels is about 1 hour. Many people skip the shuttle entirely and walk their tubes upstream at Landa Park for a DIY shorter float.
Guadalupe River: It Depends
The Guadalupe River offers two distinct experiences:
Horseshoe Loop: 45 min per lap
A short loop where you float down, get out, walk your tube back to the top, and go again. Most people do 3-5 laps, making it a half-day or full-day activity. You control how long you stay.
Long Float: 3-4 hours
A single longer float down the river, similar in duration to the San Marcos. More scenic, fewer crowds, and the crystal-clear water is stunning. Total trip from Austin: 5.5-7 hours.
What Affects Float Time
- 🌊Water levels: Higher water = faster current = shorter float. After heavy rain, a 4-hour float can become a 2.5-hour float. In drought, low water means slower movement and possibly walking over shallow sections.
- 👥Crowds: Holiday weekends create bottlenecks at narrow sections and popular sandbars. A weekday float is typically 30-45 minutes faster than the same route on a Saturday in July.
- 🏖️Stopping: If your group stops at every sandbar, swims, socializes, and takes their time, add 30-60 minutes. If you let the current carry you without stopping, you'll finish faster.
- 💨Wind: Strong headwinds on flat, wide sections can stall your tube, especially on the Guadalupe. Not much you can do except paddle with your hands.
Planning Your Day
A tubing trip is a full-day activity. Here's a sample timeline for a San Marcos float with a guided shuttle from Austin:
📅 Sample Day Timeline
- 9:00 AM Arrive at Austin pickup location
- 9:30 AM Bus departs for San Marcos
- 10:15 AM Arrive at put-in, get tubes
- 10:30 AM Enter the water. Float begins
- 2:00 PM Reach take-out point, return tubes
- 2:30 PM Bus departs for Austin
- 3:15 PM Back in Austin. Hit BBQ or a bar
Don't plan anything important after your float. You'll be tired, sun-kissed, and probably craving Austin BBQ. Check the packing list to make sure you're prepared, and review the first-timer's guide if it's your first trip.