Origin
Clarkson Valley, MO
Late night in Clarkson Valley on Tuesday
Local time
4:22 AM
CDT
Current temp
71°F
Unavailable
Live forecast
Trip from Clarkson Valley, MO to O'Fallon, MO
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
32m
Distance
20 mi
32 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$3
one way
EV Charging
Good
8 stations
Best Time to Leave
4 AM
0h 30m
★
6 AM
0h 32m
8 AM
0h 38m
10 AM
0h 34m
12 PM
0h 34m
3 PM
0h 35m
5 PM
0h 38m
8 PM
0h 31m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Clarkson Valley, MO
Mark Direen
O'Fallon, MO
Wikimedia Commons
Trip Overview
This straightforward 20-mile drive from Clarkson Valley to O'Fallon, Missouri, is designed for a single day, taking approximately 32 minutes to complete. With no highway driving, expect a local road experience focused on MO K and Clarkson Road, with a segment on Avenue of the Saints. The estimated fuel cost for this short trip is around $3, making it an economical option. This route is ideal for a quick excursion within the Midwest region, offering a simple and direct path between these two Missouri communities. Given its brevity, you won't need an overnight stay, allowing for maximum flexibility in your schedule.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| Avenue of the Saints | 8.8 mi | 10m |
| MO K | 6.3 mi | 11m |
| Clarkson Road | 2.7 mi | 4m |
| South Main Street | 0.6 mi | 1m |
| North Outer Road | 0.5 mi | <1m |
| North Outer 40 | 0.4 mi | <1m |
| Greenbank Drive | 0.3 mi | 1m |
| Olive Boulevard | <0.1 mi | <1m |
Longest stretch:
Avenue of the Saints
— 8.8 mi, about 10m
Turn-by-Turn Driving Directions
Step-by-step road directions between Clarkson Valley, MO and O'Fallon, MO.
1
Start on Greenbank Drive
0.3 mi
·
1 min
·
Greenbank Drive
2
At end of road, turn right onto Forest Club Drive
344 ft
·
21 sec
·
Forest Club Drive
3
At end of road, turn left onto MO 340
2.7 mi
·
4 min
·
Clarkson Road
4
Continue on MO 340
483 ft
·
16 sec
·
Olive Boulevard
5
Turn left onto North Outer 40
0.4 mi
·
58 sec
·
North Outer 40
6
Take the ramp
457 ft
·
11 sec
Toward I 64 West, US 40 West, US 61 North
Use the straight / slight left lanes.
7
Merge onto I 64; US 40; US 61
8.8 mi
·
10 min
·
Avenue of the Saints
Use the straight lane.
8
Take the exit
327 ft
·
6 sec
Exit 9
Toward MO K: O'Fallon
Use the straight / slight right lanes.
9
Merge onto North Outer Road
0.3 mi
·
31 sec
·
North Outer Road
10
Continue on North Outer Road
0.2 mi
·
17 sec
·
North Outer Road
11
Turn right onto MO K
3.3 mi
·
5 min
·
MO K
12
Continue on MO K
1.5 mi
·
2 min
·
MO K
Use the right lane.
13
Continue on MO K
1.6 mi
·
3 min
·
MO K
Use the right lane.
14
Continue on South Main Street
0.6 mi
·
1 min
·
South Main Street
15
Turn right
25 ft
·
1 sec
16
Arrive at destination
Heads-up: tricky spots
5 of 85 decision points cluster between mile 0.3 and 12.5 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
0.3 mi into trip
|
~1m in
|
Forest Club Drive
At end of road, turn right onto Forest Club Drive
Complex interchange - multiple decisions in a short stretch
5
0.4 mi into trip
|
~1m in
|
MO 340 / Clarkson Road
At end of road, turn left onto MO 340 / Clarkson Road
Navigation decision point
6
3.6 mi into trip
|
~7m in
Take the ramp toward I 64 West, US 40 West, US 61 North
Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight left lanes.
Toward I 64 West, US 40 West, US 61 North
5
3.7 mi into trip
|
~7m in
|
I 64; US 40; US 61 / Avenue of the Saints
Merge onto I 64; US 40; US 61 / Avenue of the Saints
Merge point - match speed before joining. Lane positioning matters here
Use the straight lane.
7
12.5 mi into trip
|
~18m in
Take the exit toward MO K: O'Fallon
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight right lanes.
Exit 9
Toward MO K: O'Fallon
Fuel & Cost
Regular Gas
$3.13 one way
$6.25 round trip
$3.97/gal
25.4 MPG avg
7 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $3.43 | $6.87 |
| premium | $4.89 | $3.85 | $7.70 |
| diesel | $5.61 | $4.42 | $8.83 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$3
Estimated CO2 emission: 7 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $2 in charging · 0 stops · 71% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 6 | 0 | $2.10 | $0.96 |
| Efficient EV | 5 | 0 | $1.75 | $0.80 |
| EV Truck/SUV | 8 | 0 | $2.80 | $1.28 |
Gas CO2
7 kg
EV CO2
2 kg (71% 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
O'Fallon, MO
Late night in O'Fallon on Tuesday
Local time
4:22 AM
CDT
Current temp
71°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
Very similar conditions
Both ends of the route are sitting at about the same temperature right now.
Road read
32m 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?
This drive is characterized by its frequent turns, offering a dynamic local road experience rather than a monotonous interstate cruise, as indicated by the 0% highway share. You'll navigate primarily on MO K and Clarkson Road, with a notable stretch of 8.8 miles along Avenue of the Saints. The longest uninterrupted segment is this 8.8-mile portion, after which the road will likely transition through various local thoroughfares. Expect a varied driving feel as you move through different community and rural settings within Missouri.
Only 0% highway — the rest is turn-by-turn surface driving.
16 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 8.8 mi on Avenue of the Saints.
How Hard Is This Drive?
6/10
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. You will hit about 8 points where you need to pay attention to lane position or signs. The trickiest moment comes around 0.3 miles in near Forest Club Drive.
Driving Effort
6/10
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 20 miles you will encounter 8 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: at 0.3 miles (Forest Club Drive): Complex interchange - multiple decisions in a short stretch; at 0.4 miles (MO 340 / Clarkson Road): Navigation decision point; at 3.6 miles: Lane positioning matters here. Multiple destination signs - pick the right one.
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 Clarkson Valley, MO to O'Fallon, MO, road signs begin pointing toward Mo K: O'fallon along the way.
Mo K: O'fallon
12.5 mi in
|
~18m
About the Cities
Arriving in O'Fallon, MO
Full guide →St. Charles, Missouri is outside of St. Louis on the bank of the Missouri River. It was Missouri's first state capital and was one of the first stops by Lewis and Clark on their journey to explore Louisiana Territory. The historic Main Street has largely been restored to its 1812-era appearance including gas lights a boardwalk and is lined with shops selling artwork, handicrafts, home decorations, antiques. There are also many restaurants.
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 32m. Total distance: 20 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
32m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
Scenic Drive
Mostly surface roads route profile with national parks nearby.
Frequently Asked Questions
The longest stretch is about 8.8 miles on Avenue of the Saints. The full list of main roads is in the Roads section above.
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 O'Fallon, MO before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
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: at 0.3 miles (Forest Club Drive): Complex interchange - multiple decisions in a short stretch; at 0.4 miles (MO 340 / Clarkson Road): Navigation decision point; at 3.6 miles: Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Gateway Arch National Park. See the National Parks section for detour distances and tips on detours.
Yes. A round trip is manageable in a single day if you plan a break at O'Fallon, MO 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, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.
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