Frost dates for Broken Bow Muni Airport, NE
At Broken Bow Muni Airport, the median last spring frost (32°F) is May 1 and the median first fall frost is Oct 7, for a typical growing season of 157 days. For a 90% chance that the last frost has passed, wait until May 15. Nearby ZIP codes are in USDA hardiness zones 5a to 5b.
- May 1Last spring frost (median)50% chance of 32°F after this date
- May 15Safer planting date10% chance of 32°F after this date
- Oct 7First fall frost (median)50% chance of 32°F by this date
- 157 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 27 | May 10 | May 24 |
| 32°F | Apr 17 | May 1 | May 15 |
| 28°F | Apr 5 | Apr 21 | May 4 |
| 24°F | Mar 26 | Apr 10 | Apr 26 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 14 | Sep 29 | Oct 9 |
| 32°F | Sep 23 | Oct 7 | Oct 18 |
| 28°F | Sep 30 | Oct 17 | Oct 27 |
| 24°F | Oct 12 | Oct 25 | Nov 5 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 120 days | 140 days | 157 days |
| 32°F | 139 days | 157 days | 176 days |
| 28°F | 157 days | 176 days | 196 days |
| 24°F | 175 days | 195 days | 214 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 68822 | 5b | -15 to -10°F | 5 km |
| 68856 | 5a | -20 to -15°F | 17 km |
| 68881 | 5b | -15 to -10°F | 23 km |
| 68814 | 5b | -15 to -10°F | 23 km |
| 68874 | 5a | -20 to -15°F | 27 km |
| 68825 | 5b | -15 to -10°F | 34 km |
| 68828 | 5b | -15 to -10°F | 35 km |
| 68813 | 5a | -20 to -15°F | 35 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USW00094946, at 41.4333, -99.6333, elevation 771 m (2,530 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 164.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Broken Bow 2 W (4 km)
- Anselmo 2 WSW (30 km)
- Oconto (34 km)
- Comstock (36 km)
- Mason City (37 km)
- Callaway 8wsw (42 km)
- Taylor (43 km)
- Arnold 4 WNW (53 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.