Station by station
When does the ground freeze in Idaho?
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.
Arco 17 SW
USCRNTypically freezes at every depth measured, down to 4 inches.
2 in2 inches: typically frozen from Nov 20 to Mar 30, a median of 131 frozen days.131 days
4 in4 inches: typically frozen from Nov 23 to Apr 4, a median of 130 frozen days.130 days
Nov 3, 2026: Not frozen
Jordan Valley Cwma
SCANTypically freezes to 4 inches, not to 8.
2 in2 inches: typically frozen from Nov 30 to Feb 10, a median of 21 frozen days.21 days
4 in4 inches: typically frozen from Jan 18 to Feb 20, a median of 12 frozen days.12 days
8 inFroze in 1 of 4 winters, no typical dates
Nov 3, 2026: Not frozen
Murphy 10 W
USCRNTypically freezes to 8 inches, not to 20.
2 in2 inches: typically frozen from Nov 29 to Feb 20, a median of 43 frozen days.43 days
4 in4 inches: typically frozen from Dec 1 to Feb 23, a median of 21 frozen days.21 days
8 in8 inches: typically frozen from Jan 24 to Feb 5, a median of 6 frozen days.6 days
20 inFroze in 1 of 5 winters, no typical dates
40 inFroze in 0 of 5 winters, no typical dates
Nov 3, 2026: Not frozen
Orchard Range Site
SCANTypically freezes to 4 inches, not to 8.
2 in2 inches: typically frozen from Dec 31 to Feb 20, a median of 40 frozen days.40 days
4 in4 inches: typically frozen from Jan 20 to Feb 16, a median of 21 frozen days.21 days
8 inFroze in 2 of 5 winters, no typical dates
20 inFroze in 0 of 5 winters, no typical dates
40 inFroze in 0 of 5 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.
