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Trip from Austin, TX to San Marcos, TX

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Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 21, 2026 · Editorial standards

Drive Time

36m

Distance

30.8 mi

50 km

Drive Score

6/10

Good drive

Same Day?

Yes, doable

Fuel Cost

$5

one way

EV Charging

Unknown

Best Time to Leave

Save up to 9 min
4 AM
0h 34m ★
6 AM
0h 37m
8 AM
0h 43m
10 AM
0h 39m
12 PM
0h 38m
3 PM
0h 39m
5 PM
0h 43m
8 PM
0h 35m

Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.

Best Time Drive vs Fly
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Downtown Austin, TX, TX

Austin, TX

Wikimedia Commons

city in and county seat of Hays County, Texas, United States, that extends into Caldwell and Guadalupe counties

San Marcos, TX

Wikimedia Commons

Trip Overview

This 30.8-mile drive from Austin to San Marcos, Texas, is a quick trip that can easily be completed in about 36 minutes. With a fuel cost estimated at $5, it's an economical option for a day trip within the Great Plains region. The route primarily utilizes local roads like East Hopkins Street and the Purple Heart Trail, with a portion on North Interstate 35, making it a turn-heavy local drive. Given its short distance and duration, this route is perfect for a single-day excursion, offering flexibility for departure and arrival times.

Main Roads

Road Distance Duration
Purple Heart Trail 27.6 mi 30m
East Hopkins Street 1.1 mi 1m
North Interstate 35 1 mi 1m
East 5th Street 0.5 mi 1m
North LBJ Drive <0.1 mi <1m
North Guadalupe Street <0.1 mi <1m
Longest stretch: Purple Heart Trail — 27.6 mi, about 30m

Turn-by-Turn Driving Directions

Step-by-step road directions between Austin, TX and San Marcos, TX.

1

Start on East 5th Street

0.5 mi · 1 min · East 5th Street
Use the straight / right lanes.
2

At end of road, turn right onto North Interstate 35

0.4 mi · 39 sec · North Interstate 35
Use the straight / slight left lanes.
3

Take the ramp

0.2 mi · 21 sec
Toward I 35 South
4

Merge onto I 35; US 290

28 mi · 30 min · Purple Heart Trail
Use the straight / slight right lanes.
5

Take the exit

0.2 mi · 26 sec
Exit 205 Toward TX 80 East, TX 142 East, TX 21 East: Bastrop, Luling Use the straight / slight right lanes.
6

Turn straight onto North Interstate 35

0.6 mi · 1 min · North Interstate 35
7

Turn slight right

472 ft · 17 sec
8

Turn slight right onto TX 80

1.1 mi · 1 min · East Hopkins Street
Use the right lane.
9

Turn right onto Loop 82

211 ft · 9 sec · North LBJ Drive
10

Turn left

421 ft · 36 sec
11

At end of road, turn left onto Loop 82

141 ft · 2 sec · North Guadalupe Street
12

Arrive at destination

Loop 82

Heads-up: tricky spots

5 of 9

5 decision points cluster between mile 0 and 30.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.

4
0 mi into trip | ~0m in | East 5th Street

Depart onto East 5th Street

Lane positioning matters here

Use the straight / right lanes.
7
0.5 mi into trip | ~1m in | North Interstate 35

At end of road, turn right onto North Interstate 35

Lane positioning matters here

Use the straight / slight left lanes.
5
1 mi into trip | ~2m in | I 35; US 290 / Purple Heart Trail

Merge onto I 35; US 290 / Purple Heart Trail

Merge point - match speed before joining. Lane positioning matters here

Use the straight / slight right lanes.
8
28.6 mi into trip | ~32m in

Take the exit toward TX 80 East, TX 142 East, TX 21 East: Bastrop, Luling

Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one

Use the straight / slight right lanes. Exit 205 Toward TX 80 East, TX 142 East, TX 21 East: Bas...
6
30.8 mi into trip | ~36m in | Loop 82 / North Guadalupe Street

At end of road, turn left onto Loop 82 / North Guadalupe Street

Complex interchange - multiple decisions in a short stretch

Fuel & Cost

Regular Gas

$4.65 one way

$9.31 round trip

$3.84/gal 25.4 MPG avg 11 kg CO2
Fuel Type $/gal One Way Round Trip
midgrade $4.20 $5.09 $10.19
premium $4.54 $5.50 $11.00
diesel $5.61 $6.80 $13.60

No toll roads detected on this route.

Drive Cost (one way)

Fuel

$5

Estimated CO2 emission: 10.8 kg one way. Prices: EIA weekly data, 2026-04-13.

Driving Electric?

About $3 in charging · 0 stops · 64% less CO2

Vehicle Type kWh Stops DC Fast Home Charge
Average EV 9.2 0 $3.23 $1.48
Efficient EV 7.7 0 $2.70 $1.23
EV Truck/SUV 12.3 0 $4.31 $1.97

Gas CO2

11 kg

EV CO2

4 kg (64% less)

This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.

DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.

Travel Intel

Current conditions at both ends of the drive.

Forecast as of Apr 20, 2026

Origin

Austin, TX

Late night in Austin on Tuesday

Local time

3:53 AM

CDT

Current temp

63°F

Showers And Thunderstorms

ENE 5 mph 77% chance Live forecast

Flash Flood Warning

Flash Flood Warning issued April 20 at 5:15PM CDT until April 20 at 6:00PM CDT by NWS Austin/San Antonio TX

Special Weather Statement

Special Weather Statement issued April 20 at 5:02PM CDT by NWS Austin/San Antonio TX

Destination

San Marcos, TX

Late night in San Marcos on Tuesday

Local time

3:53 AM

CDT

Current temp

61°F

Showers And Thunderstorms

NE 5 mph 84% chance Live forecast

Flash Flood Warning

Flash Flood Warning issued April 20 at 5:15PM CDT until April 20 at 6:00PM CDT by NWS Austin/San Antonio TX

Special Weather Statement

Special Weather Statement issued April 20 at 5:02PM CDT by NWS Austin/San Antonio TX

Time zone

Same local time

Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.

Temperature spread

2 degrees cooler at arrival

A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.

Road read

36m on the road

The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.

Weather data from the National Weather Service. Conditions may change; check closer to your travel date.

What kind of drive is this?

Expect a turn-heavy local drive on this route, with only 30% of the journey on highways. The longest continuous stretch you'll encounter is 27.6 miles on the Purple Heart Trail, offering a good amount of uninterrupted driving before navigating through more local streets. The profile suggests a mix of road types, so be prepared for changes in speed and road conditions as you transition from highway segments to local thoroughfares. This isn't a monotonous interstate cruise; it's more about navigating through communities.

Only 3% highway — the rest is turn-by-turn surface driving.
12 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 27.6 mi on Purple Heart Trail.

How Hard Is This Drive?

5/10

Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. You will hit about 9 points where you need to pay attention to lane position or signs. The trickiest moment comes early in the drive near East 5th Street.

Driving Effort 5/10

Moderate - straightforward overall, but long enough or busy enough to require pacing

Balances navigation complexity with total wheel time.

This drive requires moderate attention. Across 30.8 miles you will encounter 9 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.

Where does it get tricky?

The main spots that need attention: near the start (East 5th Street): Lane positioning matters here; at 0.5 miles (North Interstate 35): Lane positioning matters here; at 1 miles (I 35; US 290 / Purple Heart Trail): Merge point - match speed before joining. Lane positioning matters here.

Towns Mentioned on Route Signs

Based on OSRM destination-sign hints, not a full list of every settlement the road passes.

On the drive from Austin, TX to San Marcos, TX, road signs begin pointing toward Luling along the way.

Luling

28.6 mi in | ~32m

About the Cities

Starting in Austin, TX

Full guide →

“City of the Violet Crown” · Founded 1835

Austin is a city of about 1,054,000 (2026) surpassing Fort Worth to become the 4th most populous city in Texas. It is on the southeast edge of the Hill Country region of Texas, making it the fourth-largest city in the state and the 11th-largest in the country. It is the capital of Texas and a college town, and also a center of an alternative culture away from the major cities on the US coasts, though the city is rapidly gentrifying with its rising popularity. Austin's attitude is commonly emblazoned about town on T-shirts and bumper stickers that read: "Keep Austin Weird." Austin is also marketed as the Live Music Capital of the World due to the large number of venues.

Top landmarks

  • • Texas State Capitol — capitol and seat of government of the U.S. state of Texas
  • • Lyndon Baines Johnson Library and Museum — presidential library and museum for U.S. President Lyndon B. Johnson in Austin,...
  • • Texas State Cemetery — historic cemetery in Austin, Texas, USA

Arriving in San Marcos, TX

Full guide →

Founded 1808

San Marcos is a college town in the Central Hill Country region of Texas in the United States of America, about half an hour's drive south of the state's capital, Austin. The site of human habitation for over 10,000 years, it was settled in 1808 by Mexican families, and is now the home to Texas State University-San Marcos. In 2020, it had a population of 58,000 people.

Top landmarks

  • • First United Methodist Church — historic church in San Marcos, Texas, United States
  • • Hays County Courthouse — building in San Marcos, Hays County, Texas
  • • Old Main — red-roofed Victorian Gothic building on the campus of Texas State University–San...

City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).

Who Is This Route For?

Weekend Trip

Doable as a same-day drive at 36m. Total distance: 30.8 miles.

Family Friendly

Moderate complexity with 0 natural rest stops along the way.

Solo Traveler

36m drive, comfortable solo distance.

EV Driver

0 DC fast chargers along the route. Coverage: unknown.

First-Time Driver

Mostly highway driving (3%). Some complex stretches to watch for.

Scenic Drive

Mostly surface roads route profile.

Frequently Asked Questions

The longest stretch is about 27.6 miles on Purple Heart Trail. The full list of main roads is in the Roads section above.

Yes — we found about 3 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.

Yes. At under 2 hours behind the wheel, this works well for families — plan one quick stop if you have younger kids.

The main spots that need attention: near the start (East 5th Street): Lane positioning matters here; at 0.5 miles (North Interstate 35): Lane positioning matters here; at 1 miles (I 35; US 290 / Purple Heart Trail): Merge point - match speed before joining. Lane positioning matters here.

Yes. A round trip is manageable in a single day if you plan a break at San Marcos, TX before heading back.

How this page is built

Compiled by the US Trip Planner planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, and EIA for fuel prices. See our methodology for refresh cadence and limitations.

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