USDA Hardiness Zone 4a
Frost Dates for 56762 — Warren, Minnesota
NOAA 1991–2020 normals from Warren Wsd, MN (855 ft), 2 miles west.
Updated
In Warren, the last spring frost (32°F) is around May 5 in half of years and has passed by May 22 in nine years out of ten. The first fall frost comes around October 2, as early as September 20 one year in ten, leaving a typical freeze-free season of 147 days (NOAA, Warren Wsd, MN).
- Last spring frost
- May 5
- First fall frost
- October 2
- Growing season
- 147 days
- Hardiness zone
- 4a
50% probability
50% probability
freeze-free, 50%
-30 to -25°F (-34.4 to -31.7°C) coldest night
- First snow
- November 7
- Last snow
- April 12
- Winters with snow
- 100%
- Snow per year
- 43.6"
median, 1991–2020
median, 1991–2020
29 of 29 observed
NOAA normal
Frost risk by date in Warren
Half of springs at Warren Wsd, MN see their last 32°F night by May 5; only one in ten is past it by April 24, and one in ten still has one after May 22. Planting tender crops after May 11 leaves a 30% risk of a frost on them, after May 16 20%, and after May 22 10%. The 17 days between the even-odds date and the one-in-ten date is wider than at 89% of the 142 Minnesota stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 2 in half of years, as early as September 20 one year in ten, and holds off past October 13 one year in ten. A hard freeze of 28°F follows 8 days later, around October 10; in spring the one-in-ten date for 28°F is May 12, 10 days before the 32°F one. The freeze-free season lasts 147 days in a typical year, shorter than at 62% of the 142 Minnesota stations; it reaches 165 days one year in ten and falls short of 128 one year in ten. On average 184 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 11 days longer, to about May 16, and return around September 22. Severe cold of 16°F or below comes every winter, usually between November 7 and April 4.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 3 | May 6 | May 10 | May 13 | May 16 | May 20 | May 23 | May 26 | May 31 |
| 32°F | Apr 24 | Apr 28 | May 1 | May 3 | May 5 | May 8 | May 11 | May 16 | May 22 |
| 28°F | Apr 13 | Apr 18 | Apr 22 | Apr 25 | Apr 28 | Apr 30 | May 2 | May 5 | May 12 |
| 24°F | Apr 6 | Apr 10 | Apr 13 | Apr 16 | Apr 18 | Apr 21 | Apr 24 | Apr 28 | May 2 |
| 20°F | Mar 31 | Apr 4 | Apr 5 | Apr 8 | Apr 10 | Apr 13 | Apr 16 | Apr 19 | Apr 23 |
| 16°F | Mar 22 | Mar 29 | Apr 1 | Apr 3 | Apr 4 | Apr 6 | Apr 9 | Apr 12 | Apr 17 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 9 | Sep 14 | Sep 17 | Sep 20 | Sep 22 | Sep 25 | Sep 27 | Sep 30 | Oct 3 |
| 32°F | Sep 20 | Sep 24 | Sep 27 | Sep 30 | Oct 2 | Oct 4 | Oct 6 | Oct 9 | Oct 13 |
| 28°F | Sep 29 | Oct 2 | Oct 5 | Oct 7 | Oct 10 | Oct 13 | Oct 16 | Oct 19 | Oct 23 |
| 24°F | Oct 7 | Oct 11 | Oct 14 | Oct 17 | Oct 21 | Oct 24 | Oct 28 | Oct 31 | Nov 5 |
| 20°F | Oct 15 | Oct 21 | Oct 26 | Oct 29 | Nov 1 | Nov 2 | Nov 5 | Nov 8 | Nov 13 |
| 16°F | Oct 27 | Oct 31 | Nov 1 | Nov 4 | Nov 7 | Nov 10 | Nov 13 | Nov 16 | Nov 20 |
Freeze probabilities 1991–2020 at Warren Wsd, MN, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 56762 →Compare Warren with another place →
Compared with the next station
The nearest other station, Grand Forks Univ (NWS), ND, 25 miles southwest of Warren, has a last frost 5 days later (May 10), a first frost 1 day earlier (October 1), a season 3 days shorter.
When it snows in Warren, Minnesota
The first measurable snow (0.1 inch or more) in Warren usually arrives around November 7, and the last of the season around April 12. Those are the middle dates across the winters of 1991–2020 at Argyle, MN, 10.1 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 23 days after the last snow.
Planting calendar for 56762
| When | What to do |
|---|---|
| February 24 – March 10 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 10 – March 24 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 7 – April 21 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| May 5 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 10 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by September 18 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 2 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 56762 is 2 miles from Warren Wsd, MN, which stands at 855 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 56762 in zone 4a, the band where the coldest night of the year averaged -30 to -25°F (-34.4 to -31.7°C) over 1991–2020; a zone describes winter lows, not frost dates.
Frost dates across Minnesota →
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.