Frost dates · North Dakota
North Dakota frost dates, county by county.
Last spring frost and first fall frost probability data for all 53 counties in North Dakota, computed from the NOAA 1991–2020 Climate Normals. Every county page surfaces the full probability table at three temperature thresholds plus crop-specific planting guidance.
Variation across North Dakota
20 days separate the earliest and latest counties.
The median last spring frost in Traill County is April 23 — 20 days earlier than Adams County at May 13. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.
By geography
North Dakota counties on the map.
Each polygon is a county. Click for full frost-date detail. Color shows last-spring-frost timing — sage = earliest, amber = latest.
MapList
Last spring frostEarliestMedianLatest
53 counties · click any county for full frost data