Station by station
When does the ground freeze in North Dakota?
Each bar runs from the typical first freeze to the typical last thaw at that depth, the median over the station's complete winters on record, with the typical number of frozen days after it. Frost reaches the deeper probes later in the winter. A depth that froze in fewer than half of its winters has no typical dates. Stations: 4 typically freeze.
Jamestown 38 WSW
USCRNTypically freezes at every depth measured, down to 4 inches.
2 in2 inches: typically frozen from Dec 9 to Apr 11, a median of 115 frozen days.115 days
4 in4 inches: typically frozen from Dec 23 to Apr 8, a median of 112 frozen days.112 days
Nov 3, 2026: Not frozen
Mandan #1
SCANTypically freezes to 8 inches, not to 20.
2 in2 inches: typically frozen from Dec 16 to Mar 21, a median of 96 frozen days.96 days
4 in4 inches: typically frozen from Dec 21 to Apr 9, a median of 100 frozen days.100 days
8 in8 inches: typically frozen from Jan 5 to Apr 2, a median of 74 frozen days.74 days
20 inFroze in 2 of 5 winters, no typical dates
40 inFroze in 0 of 5 winters, no typical dates
Nov 3, 2026: Not frozen
Medora 7 E
USCRNTypically freezes at every depth measured, down to 4 inches.
2 in2 inches: typically frozen from Dec 1 to Mar 23, a median of 83 frozen days.83 days
4 in4 inches: typically frozen from Dec 1 to Apr 1, a median of 91 frozen days.91 days
Nov 3, 2026: Not frozen
Northgate 5 ESE
USCRNTypically freezes to 20 inches, not to 40.
2 in2 inches: typically frozen from Nov 24 to Apr 10, a median of 135 frozen days.135 days
4 in4 inches: typically frozen from Dec 8 to Apr 6, a median of 122 frozen days.122 days
8 in8 inches: typically frozen from Dec 13 to Apr 9, a median of 112 frozen days.112 days
20 in20 inches: typically frozen from Jan 22 to Mar 29, a median of 68 frozen days.68 days
40 inFroze in 1 of 3 winters, no typical dates
Nov 3, 2026: Not frozen
A winter runs July to June. Our station readings come from one grass-covered site per station at five fixed depths, and often show shallower frost than regional figures.
