Last spring frost
May 23
Frost Dates for Edgemont, NE
First fall frost
Sep 20
Growing season
117 days
Hardiness zone
4b
In an average year around Edgemont, NE, the last spring frost (32°F) is about May 23 and the first fall frost is about Sep 20, giving roughly a 117-day growing season. To be safe most years, wait until May 11 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 21 | Jun 4 | May 22 |
| Freeze (32°F) | Jun 7 | May 23 | May 11 |
| Hard (28°F) | May 27 | May 13 | May 2 |
| Severe (24°F) | May 16 | May 4 | Apr 20 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 21 | Jun 15 | Jun 11 | Jun 7 | Jun 4 | Jun 1 | May 30 | May 26 | May 22 |
| 32°F | Jun 7 | Jun 1 | May 29 | May 26 | May 23 | May 21 | May 18 | May 15 | May 11 |
| 28°F | May 27 | May 22 | May 18 | May 16 | May 13 | May 11 | May 8 | May 6 | May 2 |
| 24°F | May 16 | May 12 | May 9 | May 6 | May 4 | May 1 | Apr 29 | Apr 25 | Apr 20 |
| 20°F | May 7 | May 2 | Apr 30 | Apr 27 | Apr 24 | Apr 21 | Apr 17 | Apr 13 | Apr 8 |
| 16°F | Apr 29 | Apr 24 | Apr 20 | Apr 16 | Apr 13 | Apr 8 | Apr 4 | Mar 31 | Mar 26 |
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) | Aug 28 | Sep 10 | Sep 23 |
| Freeze (32°F) | Sep 6 | Sep 20 | Oct 2 |
| Hard (28°F) | Sep 15 | Sep 28 | Oct 9 |
| Severe (24°F) | Sep 22 | Oct 5 | Oct 20 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Aug 28 | Sep 1 | Sep 5 | Sep 8 | Sep 10 | Sep 13 | Sep 15 | Sep 19 | Sep 23 |
| 32°F | Sep 6 | Sep 11 | Sep 15 | Sep 17 | Sep 20 | Sep 23 | Sep 25 | Sep 28 | Oct 2 |
| 28°F | Sep 15 | Sep 19 | Sep 23 | Sep 26 | Sep 28 | Oct 1 | Oct 3 | Oct 5 | Oct 9 |
| 24°F | Sep 22 | Sep 27 | Oct 1 | Oct 3 | Oct 5 | Oct 8 | Oct 11 | Oct 14 | Oct 20 |
| 20°F | Sep 29 | Oct 4 | Oct 9 | Oct 12 | Oct 15 | Oct 18 | Oct 20 | Oct 24 | Oct 28 |
| 16°F | Oct 9 | Oct 14 | Oct 17 | Oct 20 | Oct 23 | Oct 25 | Oct 29 | Nov 1 | Nov 5 |
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: Edgemont, Sd, about 2.4 miles away@if(!empty($station['elevation_ft'])), at 3,432 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 Edgemont, NE?
On average, the last spring frost (32°F) around Edgemont, NE is about May 23. In cooler years it can run later, so for a safer bet many gardeners wait until May 11.
When is the first frost in the fall?
The first fall frost around Edgemont, NE typically arrives about Sep 20. 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 23 on average, or May 11 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 117 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 57735 Planting calendar → Nebraska frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026