Origin
San Marcos, TX
Late night in San Marcos on Tuesday
Local time
4:46 AM
CDT
Current temp
88°F
Unavailable
Live forecast
Trip from San Marcos, TX to Montopolis, TX
Pin this tripCompiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 21, 2026 · Editorial standards
Drive Time
41m
Distance
33.8 mi
54 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$5
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 38m
★
6 AM
0h 41m
8 AM
0h 48m
10 AM
0h 44m
12 PM
0h 43m
3 PM
0h 44m
5 PM
0h 48m
8 PM
0h 39m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
San Marcos, TX
Wikimedia Commons
Trip Overview
This 33.8-mile drive from San Marcos, TX to Montopolis, TX is a quick trip, estimated to take about 41 minutes. It's a perfect candidate for a single-day adventure, requiring no overnight stays. You'll navigate primarily via Purple Heart Trail and East 7th Street. With an estimated fuel cost of just $5, this route is budget-friendly. The journey takes you through the Great Plains region of Texas, offering a straightforward local driving experience. Consider this an easy, accessible excursion for a single day.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| Purple Heart Trail | 28.1 mi | 30m |
| East 7th Street | 2.8 mi | 4m |
| East Hopkins Street | 1.1 mi | 1m |
| North Interstate 35 | 0.6 mi | 1m |
| Airport Boulevard | 0.2 mi | <1m |
| Ed Bluestein Boulevard | 0.1 mi | <1m |
| North Guadalupe Street | <0.1 mi | <1m |
Longest stretch:
Purple Heart Trail
— 28.1 mi, about 30m
Turn-by-Turn Driving Directions
Step-by-step road directions between San Marcos, TX and Montopolis, TX.
1
Start on Loop 82
76 ft
·
8 sec
·
North Guadalupe Street
2
Turn left onto TX 80
1.1 mi
·
1 min
·
East Hopkins Street
3
Turn slight left
0.2 mi
·
49 sec
4
Turn straight onto North Interstate 35
0.6 mi
·
1 min
·
North Interstate 35
5
Take the ramp
0.3 mi
·
36 sec
Toward I 35 North
6
Merge onto I 35
28 mi
·
30 min
·
Purple Heart Trail
Use the straight / slight right lanes.
7
Take the exit
0.1 mi
·
18 sec
Exit 234C
Toward 6th - 12th Streets
Use the slight right lane.
8
Turn straight onto North Interstate 35
344 ft
·
10 sec
·
North Interstate 35
9
Turn right onto East 7th Street
2.8 mi
·
4 min
·
East 7th Street
Use the right lane.
10
Turn straight onto Loop 111
0.2 mi
·
19 sec
·
Airport Boulevard
11
Continue on US 183
0.1 mi
·
8 sec
·
Ed Bluestein Boulevard
12
Take the ramp
486 ft
·
11 sec
Toward 183 Toll South: Lockhart
13
Arrive at destination
Toward 183 Toll South: Lockhart
Heads-up: tricky spots
5 of 75 decision points cluster between mile 0 and 33.7 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
3
0 mi into trip
|
~0m in
|
TX 80 / East Hopkins Street
Turn left onto TX 80 / East Hopkins Street
Navigation decision point
5
2.2 mi into trip
|
~4m in
|
I 35 / Purple Heart Trail
Merge onto I 35 / Purple Heart Trail
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
7
30.3 mi into trip
|
~35m in
Take the exit toward 6th - 12th Streets
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 234C
Toward 6th - 12th Streets
5
30.5 mi into trip
|
~35m in
|
East 7th Street
Turn right onto East 7th Street
Lane positioning matters here
Use the right lane.
4
33.7 mi into trip
|
~40m in
Take the ramp toward 183 Toll South: Lockhart
Navigation decision point
Toward 183 Toll South: Lockhart
Fuel & Cost
Regular Gas
$5.11 one way
$10.21 round trip
$3.84/gal
25.4 MPG avg
12 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.20 | $5.59 | $11.18 |
| premium | $4.54 | $6.03 | $12.07 |
| diesel | $5.61 | $7.46 | $14.93 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$5
Estimated CO2 emission: 11.8 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $4 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 10.1 | 0 | $3.55 | $1.62 |
| Efficient EV | 8.5 | 0 | $2.96 | $1.35 |
| EV Truck/SUV | 13.5 | 0 | $4.73 | $2.16 |
Gas CO2
12 kg
EV CO2
4 kg (67% 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.
Destination
Montopolis, TX
Late night in Montopolis on Tuesday
Local time
4:46 AM
CDT
Current temp
89°F
Unavailable
Live forecast
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
1 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
41m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
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, characterized by its frequent changes in direction rather than long, uninterrupted stretches. While there's a highway share of 2, the majority of the 33.8 miles will likely be on local roads. The longest continuous section you'll encounter is 28.1 miles on Purple Heart Trail. This road profile suggests a driving experience that keeps you engaged with the surroundings as you make your way through Texas.
Only 2% highway — the rest is turn-by-turn surface driving.
13 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 28.1 mi on Purple Heart Trail.
How Hard Is This Drive?
4/10
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near TX 80 / East Hopkins Street.
Driving Effort
4/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 41m drive. You will face about 7 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: near the start (TX 80 / East Hopkins Street): Navigation decision point; at 2.2 miles (I 35 / Purple Heart Trail): Merge point - match speed before joining. Lane positioning matters here; at 30.3 miles: Exit ramp - move to the correct lane early. 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.
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 San Marcos, TX to Montopolis, TX, road signs begin pointing toward 6Th - 12Th Streets along the way.
6Th - 12Th Streets
30.3 mi in
|
~35m
About the Cities
Starting 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 41m. Total distance: 33.8 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
41m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (2%). Straightforward navigation.
Scenic Drive
Mostly surface roads route profile.
Frequently Asked Questions
The longest stretch is about 28.1 miles on Purple Heart Trail. The full list of main roads is in the Roads section above.
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 (TX 80 / East Hopkins Street): Navigation decision point; at 2.2 miles (I 35 / Purple Heart Trail): Merge point - match speed before joining. Lane positioning matters here; at 30.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Yes. A round trip is manageable in a single day if you plan a break at Montopolis, 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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