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Elevation from Boulder to Custer
Max elevation: 6361 ft / 1939 m
Min elevation: 3422 ft / 1043 m
Elevation change: 2939 ft / 896 m
Min elevation: 3422 ft / 1043 m
Elevation change: 2939 ft / 896 m
Max grade: 5%
Min grade: -3.6%
Steepness score: 89 + 498 + 4073 + 11 = 4671
Min grade: -3.6%
Steepness score: 89 + 498 + 4073 + 11 = 4671
Distance: 347.94 mi / 559.96 km
Travel Time: 5 hours 23 mins
Travel Time: 5 hours 23 mins
| Difficulty | % Grade | |
| Easiest | <5% | |
| Easy | 5-10% | |
| Moderate | 10-15% | |
| Difficult | 15-20% | |
| Very Difficult | >20% |
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 Boulder to Custer. You can also view a 3-D map of Boulder elevation or Custer elevation.
These are some of the possible highways 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 Boulder and Custer.
US 36 | 9 mi / 14 km |
| Northwest Pkwy | 8 mi / 13 km |
 | 88 mi / 142 km |
US 85 | 132 mi / 212 km |
US 18 | 81 mi / 130 km |
SD 89 | 15 mi / 24 km |
US 385 | 12 mi / 19 km |
