Last spring frost
Apr 29
Frost Dates for New Ulm, MN
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
In an average year around New Ulm, MN, the last spring frost (32°F) is about Apr 29 and the first fall frost is about Oct 7, giving roughly a 161-day growing season. To be safe most years, wait until Apr 15 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) | May 23 | May 7 | Apr 25 |
| Freeze (32°F) | May 12 | Apr 29 | Apr 15 |
| Hard (28°F) | May 2 | Apr 18 | Apr 3 |
| Severe (24°F) | Apr 23 | Apr 8 | Mar 26 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 23 | May 16 | May 13 | May 10 | May 7 | May 5 | May 3 | Apr 30 | Apr 25 |
| 32°F | May 12 | May 7 | May 4 | May 1 | Apr 29 | Apr 26 | Apr 23 | Apr 19 | Apr 15 |
| 28°F | May 2 | Apr 27 | Apr 24 | Apr 20 | Apr 18 | Apr 15 | Apr 11 | Apr 7 | Apr 3 |
| 24°F | Apr 23 | Apr 18 | Apr 15 | Apr 11 | Apr 8 | Apr 6 | Apr 3 | Mar 31 | Mar 26 |
| 20°F | Apr 17 | Apr 10 | Apr 6 | Apr 3 | Mar 31 | Mar 29 | Mar 24 | Mar 20 | Mar 15 |
| 16°F | Apr 7 | Apr 2 | Mar 29 | Mar 26 | Mar 22 | Mar 19 | Mar 16 | Mar 12 | Mar 7 |
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 16 | Sep 28 | Oct 12 |
| Freeze (32°F) | Sep 22 | Oct 7 | Oct 23 |
| Hard (28°F) | Oct 4 | Oct 21 | Nov 1 |
| Severe (24°F) | Oct 14 | Oct 30 | Nov 13 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 16 | Sep 19 | Sep 23 | Sep 26 | Sep 28 | Oct 1 | Oct 4 | Oct 7 | Oct 12 |
| 32°F | Sep 22 | Sep 28 | Oct 1 | Oct 5 | Oct 7 | Oct 11 | Oct 15 | Oct 19 | Oct 23 |
| 28°F | Oct 4 | Oct 9 | Oct 13 | Oct 18 | Oct 21 | Oct 23 | Oct 26 | Oct 28 | Nov 1 |
| 24°F | Oct 14 | Oct 21 | Oct 24 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 8 | Nov 13 |
| 20°F | Oct 24 | Oct 30 | Nov 1 | Nov 4 | Nov 7 | Nov 9 | Nov 12 | Nov 16 | Nov 22 |
| 16°F | Nov 1 | Nov 5 | Nov 8 | Nov 11 | Nov 13 | Nov 16 | Nov 20 | Nov 25 | Dec 1 |
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: New Ulm 2 Se, Mn, about 1.1 miles away@if(!empty($station['elevation_ft'])), at 890 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 New Ulm, MN?
On average, the last spring frost (32°F) around New Ulm, MN is about Apr 29. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 15.
When is the first frost in the fall?
The first fall frost around New Ulm, MN typically arrives about Oct 7. 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 Apr 29 on average, or Apr 15 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 161 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 56073 Planting calendar → Minnesota frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026