Distance between cities › USA › Montana › Boulder, MT › Distance from Boulder to Annawan Book Hotels

Distance from Boulder, MT to Annawan, IL

Distance

1,373 mi

Time

1 day

Gas Cost

$128 - $249

There are 1,152.57 miles from Boulder to Annawan in southeast direction and 1,373 miles (2,209.63 kilometers) by car, following the I-90 and US-14 and US-16 Truck and SD 79 route.

Boulder and Annawan are 1 day far apart, if you drive non-stop .

This is the fastest route from Boulder, MT to Annawan, IL. The halfway point is Belvidere, SD.

Please note the time difference between Boulder, MT and Annawan, IL is 1 hour. The current time in Boulder is 12:01 am and the current time in Annawan is 1:01 am.

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Lowest Price Rental Cars in Boulder, MT

Planning on renting a car to go from Boulder, MT to Annawan, IL? Here there are some offers to rent a car in Boulder, MT

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Boulder »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 55.14 gallons of gas to cover the route between Boulder, MT and Annawan, IL.

The estimated cost of gas to go from Boulder to Annawan is $179.85.

During the route, an average car will release 1,080.22 pounds of CO₂ to the atmosphere. The carbon footprint would be 0.79 pounds of CO₂ per mile.

Average USA gas price used for calculation is $3.26 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Boulder, MT and Annawan, IL

If you want to meet halfway between Boulder, MT and Annawan, IL or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.870129 and -101.122765, or 43º 52' 12.4644" N, 101º 7' 21.954" W. This location is 686.44 miles away from Boulder, MT and Annawan, IL and it would take approximately 12 hours 2 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Belvidere, SD, situated 703 miles from Boulder, MT and 707 miles from Annawan, IL. It would take 10 hours 45 mins to go from Boulder to Belvidere and 10 hours 7 mins to go from Annawan to Belvidere.