Last spring frost
May 22
Frost Dates for Alliance, NE
First fall frost
Sep 22
Growing season
122 days
Hardiness zone
5b
In an average year around Alliance, NE, the last spring frost (32°F) is about May 22 and the first fall frost is about Sep 22, giving roughly a 122-day growing season. To be safe most years, wait until May 10 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Jun 19 | Jun 2 | May 20 |
| Freeze (32°F) | Jun 5 | May 22 | May 10 |
| Hard (28°F) | May 25 | May 12 | Apr 30 |
| Severe (24°F) | May 15 | May 2 | Apr 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 19 | Jun 14 | Jun 8 | Jun 5 | Jun 2 | May 31 | May 27 | May 24 | May 20 |
| 32°F | Jun 5 | May 31 | May 28 | May 25 | May 22 | May 19 | May 16 | May 13 | May 10 |
| 28°F | May 25 | May 20 | May 16 | May 14 | May 12 | May 9 | May 6 | May 4 | Apr 30 |
| 24°F | May 15 | May 11 | May 7 | May 4 | May 2 | Apr 30 | Apr 27 | Apr 23 | Apr 19 |
| 20°F | May 6 | May 1 | Apr 29 | Apr 26 | Apr 22 | Apr 19 | Apr 16 | Apr 12 | Apr 6 |
| 16°F | Apr 27 | Apr 22 | Apr 18 | Apr 14 | Apr 11 | Apr 7 | Apr 3 | Mar 30 | Mar 21 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Sep 1 | Sep 13 | Sep 26 |
| Freeze (32°F) | Sep 7 | Sep 22 | Oct 4 |
| Hard (28°F) | Sep 16 | Oct 1 | Oct 12 |
| Severe (24°F) | Sep 26 | Oct 9 | Oct 21 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 1 | Sep 4 | Sep 7 | Sep 11 | Sep 13 | Sep 16 | Sep 19 | Sep 22 | Sep 26 |
| 32°F | Sep 7 | Sep 13 | Sep 16 | Sep 19 | Sep 22 | Sep 25 | Sep 28 | Oct 1 | Oct 4 |
| 28°F | Sep 16 | Sep 22 | Sep 25 | Sep 28 | Oct 1 | Oct 3 | Oct 5 | Oct 8 | Oct 12 |
| 24°F | Sep 26 | Sep 30 | Oct 4 | Oct 6 | Oct 9 | Oct 12 | Oct 14 | Oct 17 | Oct 21 |
| 20°F | Oct 4 | Oct 10 | Oct 13 | Oct 15 | Oct 17 | Oct 19 | Oct 22 | Oct 25 | Oct 29 |
| 16°F | Oct 12 | Oct 16 | Oct 18 | Oct 21 | Oct 24 | Oct 26 | Oct 29 | Nov 1 | Nov 6 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Alliance Muni Ap, Ne, about 14.8 miles away@if(!empty($station['elevation_ft'])), at 3,924 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Alliance, NE?
On average, the last spring frost (32°F) around Alliance, NE is about May 22. In cooler years it can run later, so for a safer bet many gardeners wait until May 10.
When is the first frost in the fall?
The first fall frost around Alliance, NE typically arrives about Sep 22. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around May 22 on average, or May 10 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 122 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 69331 Planting calendar → Nebraska frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026