Frost dates for Montana

In Montana, the typical last spring frost runs from May 4 in Billings to May 16 in Missoula. The typical first fall frost runs from Sep 26 in Missoula to Oct 7 in Billings.

So far this fall, 2 of the 2 cities in Montana that file a daily climate report have logged a freeze.

NCEI U.S. Climate Normals 1991-2020, annual/seasonal (c20230404)

A typical date is the median: half of years have an earlier last spring frost, half a later one. An early year means 1 year in 10, and a late year means 1 year in 10. Dates come from the U.S. Climate Normals for 1991-2020, published by NOAA's National Centers for Environmental Information, using a daily low of 32F or below as a freeze.

Frost dates by ZIP code and city

The daily climate report is issued by the local National Weather Service forecast office and delivered to this page by the Iowa Environmental Mesonet of Iowa State University. Under 17 U.S.C. 105, no copyright attaches to the government-produced figures on this page, including reports, alerts, station observations, and normals, which were created by the National Weather Service and other NOAA offices. The notice that 17 U.S.C. 403 requires appears in this sentence. It does not imply endorsement by or affiliation with those agencies. See: Data sources and attribution.