Mount Pleasant, SC to Whitmire, SC is 167.8 miles and takes about 3h 12m via I 26 and State Highway 121, with a fuel budget near $26 and enough daylight to finish in a day. This trip stays within the Southeast region, primarily traversing South Carolina. With 98% of the drive on highways, expect a straightforward trip with minimal time spent on slower surface roads. The route is well-suited for a single day, making it a convenient option for those looking to reach their destination without an overnight stay.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Break Rhythm
1 planned break
A short stop every 2 to 3 hours is enough for this drive.
Midpoint
83.9 miles from Mount Pleasant, SC
A natural place for your longest stop of the day
, about 1h 35m into the drive
.
Main Roads
Road
Distance
Duration
I 26
138.9 mi
2h 32m
State Highway 121
12.9 mi
19m
Mark Clark Expressway
12 mi
14m
Chuck Dawley Boulevard
1.3 mi
2m
Rivers Avenue
1.1 mi
1m
Church Street
0.4 mi
<1m
Coleman Boulevard
<0.1 mi
<1m
Longest stretch:
I 26
— 138.9 mi, about 2h 32m
Traffic on I-26
Hour-of-day weekday pattern from 134 FHWA count stations on your route.
Peak
3 PM
~2,824 veh/hr typical
· worst 3,472
Quietest
2 AM
~230 veh/hr
Peak-to-quiet ratio
12.3×
busier at peak than in the quiet hours
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Averaged across 105 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 Mount Pleasant, SC and Whitmire, SC.
1
Start on this road
76 ft·10 sec·this road
2
Turn right onto SC 703
237 ft·9 sec·Coleman Boulevard
3
Turn left onto I 526 Bus
1.3 mi·2 min·Chuck Dawley Boulevard
4
Turn straight onto I 526
12 mi·14 min·Mark Clark Expressway
Toward North CharlestonUse the straight / slight right lanes.
5
Take the exit
0.2 mi·31 sec
Exit 18BToward US 52 West, US 78 West: Rivers AvenueUse the slight right lane.
6
Turn slight right onto US 52; US 78
1.1 mi·1 min·Rivers Avenue
Use the straight lane.
7
Turn straight
0.1 mi·20 sec
8
Take the ramp
0.5 mi·45 sec
Toward I 26 North: Columbia
9
Merge onto I 26
139 mi·2 hr 32 min·I 26
Use the straight / slight right lanes.
10
Take the exit
0.3 mi·36 sec
Toward SC 121: Whitmire, Union
11
Turn right onto SC 121
13 mi·19 min·State Highway 121
12
Turn left onto Church Street
0.4 mi·32 sec·Church Street
13
Arrive at destination
SC 72
Trip Plan
Given the 3h 12m estimated duration, departing in the morning from Mount Pleasant will allow ample time to reach Whitmire before evening. The 167.8-mile distance is easily manageable in one day, so you can enjoy flexibility with stops. Keep an eye on your fuel, especially during the 138.9-mile stretch on I 26, as services might be less frequent. Plan for a potential stop around the point where you transition from I 26 to State Highway 121, as this marks a shift in the road type and potential service availability.
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 83.9 miles from Mount Pleasant, SC, or about 1h 35m into the drive.
The longest continuous stretch on this route runs about 138.9 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 37 miles or 44m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 83.9 miles or 1h 35m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 2h 34m
Traffic, exits, and arrival timing usually matter more near Whitmire, SC than in the middle of the route.
Before You Leave
+
Open the route before leaving Mount Pleasant, SC 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 Mount Pleasant, SC
This is one driving day of about 167.8 miles and 3h 12m.
Your first comfortable stop window is around 37 miles from Mount Pleasant, SC.
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 I 26 for about 138.9 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 9
5 decision points cluster between mile 0 and 154.2 — 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|SC 703 / Coleman Boulevard
Turn right onto SC 703 / Coleman Boulevard
Navigation decision point
4
1.4 mi into trip|~2m in|I 526 / Mark Clark Expressway
Turn straight onto I 526 / Mark Clark Expressway toward North Charleston
Lane positioning matters here
Use the straight / slight right lanes.
Toward North Charleston
8
13.3 mi into trip|~17m in
Take the exit toward US 52 West, US 78 West: Rivers Avenue
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Exit 18B
Toward US 52 West, US 78 West: Rivers Avenue
5
15.3 mi into trip|~20m in|I 26
Merge onto I 26
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
5
154.2 mi into trip|~2h 52m in
Take the exit toward SC 121: Whitmire, Union
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward SC 121: Whitmire, Union
Fuel & Cost
Regular Gas
$26.66 one way
$53.31 round trip
$4.04/gal25.4 MPG avg59 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.40
$29.07
$58.14
premium
$4.78
$31.58
$63.16
diesel
$6.18
$40.82
$81.64
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$27
Meals
$25–$50
Total
$52–$77
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 58.7 kg one way.
Prices: EIA weekly data, 2026-10-12.
Driving Electric?
About $18 in charging
· 0 stops
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
50.3
0
$17.62
$8.05
Efficient EV
42
0
$14.68
$6.71
EV Truck/SUV
67.1
0
$23.49
$10.74
Gas CO2
59 kg
EV CO2
20 kg (66% 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 Oct 19, 2026
Origin
Mount Pleasant, SC
Morning
in Mount Pleasant on Tuesday
Local time
7:47 AM
EDT
Current temp
69°F
Sunny
N 13 mph0% chanceLive forecast
Beach Hazards Statement
Beach Hazards Statement issued October 19 at 2:20AM EDT until October 19 at 8:00PM EDT by NWS Wilmington NC
Rip Current Statement
Rip Current Statement issued October 19 at 2:15AM EDT until October 19 at 8:00PM EDT by NWS Charleston SC
Destination
Whitmire, SC
Morning
in Whitmire on Tuesday
Local time
7:47 AM
EDT
Current temp
43°F
Unavailable
Live forecast
75°F
Oak Grove, SC
84 mi in
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
26 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
3h 12m 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.
National Parks Near This Route
Worth a detour if your schedule allows.
Fort Sumter and Fort Moultrie National Historical Park
National Historical Park
Two forts stand at the entrance of Charleston Harbor. Patriots inside a palmetto log fort, later named Fort Moultrie, defeated the Royal Navy in 1776. As Charleston blazed a path towards secession to...
Astonishing biodiversity exists in Congaree National Park, the largest intact expanse of old growth bottomland hardwood forest remaining in the southeastern United States. Waters from the Congaree and...
11 mi from route
~28 min detour
Free
near mile 92.6
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route is almost entirely highway driving, with 98% of the 167.8 miles on major roads like I 26. You'll experience a long stretch of 138.9 miles on I 26 before transitioning to State Highway 121. Expect to encounter a high volume of exits and merging traffic typical of interstate cruising for the majority of your drive.
98% highway — fuel and pacing are the main things to plan.
13 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 138.9 mi on I 26.
How Hard Is This Drive?
3/10
This is a straightforward highway drive that stays mostly on I 26 and State Highway 121. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near SC 703 / Coleman Boulevard.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 3h 12m drive. You will face about 9 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 (SC 703 / Coleman Boulevard): Navigation decision point; at 1.4 miles (I 526 / Mark Clark Expressway): Lane positioning matters here; at 13.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Elevation Profile
Mostly flat terrain
502 ft6 ft
Total Climb
557 ft
Total Descent
143 ft
Highest Point
502 ft
~155.8 mi in
Elevation Range
496 ft
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 Mount Pleasant, SC to Whitmire, SC, road signs begin pointing toward Union along the way.
Mount Pleasant is a large town in the Greater Charleston region of South Carolina. The population of the town has exploded, making it a very popular bedroom community of the city of Charleston.
Top landmarks
•USS Yorktown — 1943 Essex-class aircraft carrier
•USS Laffey — 1943 Allen M. Sumner-class destroyer
•Charles Pinckney National Historic Site — human settlement in Mount Pleasant, South Carolina, United States of America
The longest stretch is about 138.9 miles on I 26. The full list of main roads is in the Roads section above.
Yes — we found about 16 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, with realistic expectations. Build in a stop roughly every 2 hours, have snacks and activities ready, and check the Nearby Places tabs for kid-friendly stops along the way.
The main spots that need attention: near the start (SC 703 / Coleman Boulevard): Navigation decision point; at 1.4 miles (I 526 / Mark Clark Expressway): Lane positioning matters here; at 13.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Fort Sumter and Fort Moultrie National Historical Park and Congaree National Park. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 3.2 hours each way, an in-and-out day trip would put you behind the wheel for 6.4 hours — manageable with a long break at Whitmire, SC, but most travelers stay overnight.
