Smithville, TX to Laredo, TX is 256.5 miles and takes about 4h 35m via Purple Heart Trail and I-10, with a fuel budget near $39 and enough daylight to finish in a day. This route keeps you within Texas, moving from the Great Plains region to another part of the Great Plains. Expect a mix of highway driving and surface roads as you make your way south. With only one recommended stop and a manageable duration, this trip is well-suited for a single day of travel.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
128.2 miles from Smithville, TX
A natural place for your longest stop of the day
, about 2h 25m into the drive
.
Hour-of-day weekday pattern from 48 FHWA count stations on your route.
Peak
5 PM
~1,436 veh/hr typical
· worst 1,709
Quietest
2 AM
~234 veh/hr
Peak-to-quiet ratio
6.1×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 52 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Smithville, TX and Laredo, TX.
1
Start on Main Street
43 ft·5 sec·Main Street
2
Turn right onto Loop 230
0.3 mi·34 sec·3rd Street
3
Turn left onto TX 95
351 ft·6 sec·Royston Street
4
Continue on TX 95
0.8 mi·1 min·State Highway 95
5
Turn right onto FM 535
11 mi·18 min·FM 535
6
Turn left onto TX 304
21 mi·23 min·TX 304
7
Turn right
0.2 mi·27 sec
8
Take the ramp
0.2 mi·25 sec
9
Merge onto I 10
49 mi·48 min·I 10
Use the straight / slight right lanes.
10
Keep slight left at fork onto I 10; US 90; TX 130
12 mi·12 min·I 10; US 90; TX 130
Use the straight / slight right lanes.
11
Keep slight left at fork onto I 10; US 90; TX 130
0.8 mi·51 sec·90th Infantry Division Highway
Use the straight / slight right lanes.
12
Continue on I 10; US 90
8.0 mi·9 min·Jose Lopez Freeway
Use the straight / slight right lanes.
13
Take the exit onto I 10; US 87
0.2 mi·22 sec·I 10; US 87
Exit 572Toward I 35, I 10 West, US 87 North: Laredo, El Paso, AustinUse the straight / slight right lanes.
14
Keep slight left at fork
0.5 mi·1 min
Toward I 35 South: LaredoUse the slight left lane.
15
Merge onto I 35
8.3 mi·9 min·South Pan Am Expressway
Use the straight / slight right lanes.
16
Continue on I 35
144 mi·2 hr 26 min·Purple Heart Trail
Use the straight / slight right lanes.
17
Turn right onto Houston Street
0.3 mi·42 sec·Houston Street
18
Turn left onto I 35 Bus
272 ft·12 sec·Salinas Avenue
19
Turn left onto Matamoros Street
306 ft·5 sec·Matamoros Street
20
Arrive at destination
Matamoros Street
Trip Plan
Given the 4h 35m duration, starting in the morning will give you plenty of time to reach Laredo before dark. There's only one recommended stop, so plan your breaks accordingly. Keep an eye on your fuel gauge, especially during the 144.5-mile stretch on the Purple Heart Trail, as services might be less frequent. The $39 fuel cost is an estimate, so it's always wise to have a little extra budgeted. This is a straightforward, single-day trip, so you have flexibility to depart when it's most convenient for you.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 128.2 miles from Smithville, TX, or about 2h 25m into the drive.
The longest continuous stretch on this route runs about 144.5 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 56 miles or 1h 8m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 128.2 miles or 2h 25m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 3h 48m
Traffic, exits, and arrival timing usually matter more near Laredo, TX than in the middle of the route.
Before You Leave
+
Open the route before leaving Smithville, TX so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Smithville, TX
This is one driving day of about 256.5 miles and 4h 35m.
Your first comfortable stop window is around 56 miles from Smithville, TX.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on Purple Heart Trail for about 144.5 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 15
5 decision points cluster between mile 0 and 102.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0 mi into trip|~0m in|Loop 230 / 3rd Street
Turn right onto Loop 230 / 3rd Street
Navigation decision point
6
81.8 mi into trip|~1h 34m in|I 10; US 90; TX 130
Keep slight left at fork onto I 10; US 90; TX 130
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
6
93.9 mi into trip|~1h 47m in|I 10; US 90; TX 130 / 90th Infantry Division Highway
Keep slight left at fork onto I 10; US 90; TX 130 / 90th Infantry Division Highway
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
8
102.6 mi into trip|~1h 57m in|I 10; US 87
Take the exit onto I 10; US 87 toward I 35, I 10 West, US 87 North: Laredo, El Paso, Austin
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 572
Toward I 35, I 10 West, US 87 North: Laredo, El...
7
102.8 mi into trip|~1h 57m in
Keep slight left at fork toward I 35 South: Laredo
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight left lane.
Toward I 35 South: Laredo
Fuel & Cost
Regular Gas
$35.13 one way
$70.26 round trip
$3.48/gal25.4 MPG avg90 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$3.89
$39.24
$78.48
premium
$4.23
$42.67
$85.33
diesel
$4.80
$48.43
$96.86
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$35
Meals
$25–$50
Total
$60–$85
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 89.7 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $27 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
77
0
$26.93
$12.31
Efficient EV
64.1
0
$22.44
$10.26
EV Truck/SUV
102.6
1
$35.91
$16.42
Gas CO2
90 kg
EV CO2
30 kg (67% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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 Jul 18, 2026
Origin
Smithville, TX
Late night
in Smithville on Monday
Local time
5:27 AM
CDT
Current temp
77°F
Mostly Cloudy
S 5 mph1% chanceLive forecast
Flood Warning
Flood Warning issued July 18 at 3:19AM CDT until July 22 at 7:46AM CDT by NWS Corpus Christi TX
Flood Warning
Flood Warning issued July 18 at 3:19AM CDT until July 21 at 3:48AM CDT by NWS Corpus Christi TX
Destination
Laredo, TX
Late night
in Laredo on Monday
Local time
5:27 AM
CDT
Current temp
79°F
Mostly Cloudy
SE 14 mph1% chanceLive forecast
Flood Warning
Flood Warning issued July 18 at 3:19AM CDT until July 22 at 7:46AM CDT by NWS Corpus Christi TX
Flood Warning
Flood Warning issued July 18 at 3:19AM CDT until July 21 at 3:48AM CDT by NWS Corpus Christi TX
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
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 warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
4h 35m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
San Antonio Missions National Historical Park
National Historical Park
Welcome to San Antonio Missions, a National Park Service site and the only UNESCO World Heritage Site in Texas. Each mission in the park is a center of community and has been since the early 1700s. Th...
7 mi from route
~17 min detour
Free
near mile 106.1
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
About 43% of this 256.5-mile drive is on highways, meaning you'll encounter stretches of faster travel. The longest continuous stretch without a significant change in road type is 144.5 miles, primarily on the Purple Heart Trail. You'll transition between highway cruising and more typical surface road driving, so be ready for changes in speed limits and traffic patterns. Expect a mixed profile of highway and surface roads throughout the trip.
43% highway, the rest on surface roads — varied driving throughout.
20 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 144.5 mi on Purple Heart Trail.
How Hard Is This Drive?
8/10
This route mixes highway mileage with some local-road sections near the start or finish. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes early in the drive near Loop 230 / 3rd Street.
Driving Effort8/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 15 significant decision points across 256.5 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: near the start (Loop 230 / 3rd Street): Navigation decision point; at 81.8 miles (I 10; US 90; TX 130): Highway fork - watch signs carefully. Lane positioning matters here; at 93.9 miles (I 10; US 90; TX 130 / 90th Infantry Division Highway): Highway fork - watch signs carefully. Lane positioning matters here.
Elevation Profile
Mostly flat terrain
745 ft327 ft
Total Climb
939 ft
Total Descent
852 ft
Highest Point
745 ft
~128.5 mi in
Elevation Range
419 ft
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Smithville, TX and Laredo, TX, road signs point toward El Paso and Austin.
Doable as a same-day drive at 4h 35m. Total distance: 256.5 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
4h 35m drive, comfortable solo distance.
Scenic Drive
Mixed highway & surface route profile with national parks nearby.
Frequently Asked Questions
The longest stretch is about 144.5 miles on Purple Heart Trail. The full list of main roads is in the Roads section above.
Yes — we found about 34 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.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Laredo, TX before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 34 rest areas along the route for bathroom stops.
The main spots that need attention: near the start (Loop 230 / 3rd Street): Navigation decision point; at 81.8 miles (I 10; US 90; TX 130): Highway fork - watch signs carefully. Lane positioning matters here; at 93.9 miles (I 10; US 90; TX 130 / 90th Infantry Division Highway): Highway fork - watch signs carefully. Lane positioning matters here.
Yes — San Antonio Missions National Historical Park. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 4.6 hours each way, an in-and-out day trip would put you behind the wheel for 9.2 hours — manageable with a long break at Laredo, TX, but most travelers stay overnight.
