Max elevation: 6350 ft / 1935 m Min elevation: 3138 ft / 956 m Elevation change: 3212 ft / 979 m
Max grade: 5.6% Min grade: -6.6% Steepness score: 78 + 663 + 4221 + 11 = 4973
Distance: 348.88 mi / 561.47 km Travel Time: 5 hours 5 mins
Difficulty
% Grade
Easiest
<5%
Easy
5-10%
Moderate
10-15%
Difficult
15-20%
Very Difficult
>20%
It looks like one possible route that might be flatter would be to go through Seattle, but make sure you double check everything if you're planning a road trip.
Elevation data comes from different sources and may not reflect true
driving conditions, so talk to other RVers if you're concerned about
steep grades. If you're planning to drive in the winter and you want to avoid snow, check the road conditions from Missoula to Billings. You can also view a 3-D map of Missoula elevation or Billings elevation.
Flattest Route
These are some of the possible roads along this route. Use the GPS in your car to verify all driving directions. If you're looking for campgrounds along the way, search for RV parks between Missoula and Billings.