USDA Hardiness Zone 4b
Frost Dates for 55302 — Annandale, Minnesota
NOAA 1991–2020 normals from Kimball 3N, MN (1,160 ft), 12 miles northwest.
Updated
In Annandale, the last spring frost (32°F) is around May 2 in half of years and has passed by May 15 in nine years out of ten. The first fall frost comes around October 5, as early as September 23 one year in ten, leaving a typical freeze-free season of 156 days (NOAA, Kimball 3N, MN).
- Last spring frost
- May 2
- First fall frost
- October 5
- Growing season
- 156 days
- Hardiness zone
- 4b
50% probability
50% probability
freeze-free, 50%
-25 to -20°F (-31.7 to -28.9°C) coldest night
- First snow
- November 13
- Last snow
- April 9
- Winters with snow
- 100%
- Snow per year
- 39.8"
median, 1991–2020
median, 1991–2020
20 of 20 observed
NOAA normal
Frost risk by date in Annandale
Half of springs at Kimball 3N, MN see their last 32°F night by May 2; only one in ten is past it by April 19, and one in ten still has one after May 15. Planting tender crops after May 7 leaves a 30% risk of a frost on them, after May 9 20%, and after May 15 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 61% of the 142 Minnesota stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 5 in half of years, as early as September 23 one year in ten, and holds off past October 21 one year in ten. A hard freeze of 28°F follows 14 days later, around October 19; in spring the one-in-ten date for 28°F is May 5, 10 days before the 32°F one. The freeze-free season lasts 156 days in a typical year, longer than at 67% of the 142 Minnesota stations; it reaches 176 days one year in ten and falls short of 136 one year in ten. On average 168 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 9 days longer, to about May 11, and return around September 27. Severe cold of 16°F or below comes every winter, usually between November 13 and March 30.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 30 | May 3 | May 6 | May 8 | May 11 | May 14 | May 17 | May 21 | May 27 |
| 32°F | Apr 19 | Apr 24 | Apr 28 | Apr 30 | May 2 | May 4 | May 7 | May 9 | May 15 |
| 28°F | Apr 8 | Apr 13 | Apr 17 | Apr 20 | Apr 23 | Apr 26 | Apr 29 | May 1 | May 5 |
| 24°F | Apr 1 | Apr 4 | Apr 7 | Apr 10 | Apr 13 | Apr 16 | Apr 18 | Apr 22 | Apr 27 |
| 20°F | Mar 22 | Mar 28 | Apr 1 | Apr 3 | Apr 5 | Apr 7 | Apr 10 | Apr 14 | Apr 19 |
| 16°F | Mar 14 | Mar 19 | Mar 22 | Mar 26 | Mar 30 | Apr 1 | Apr 3 | Apr 6 | Apr 12 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 14 | Sep 19 | Sep 22 | Sep 24 | Sep 27 | Sep 30 | Oct 2 | Oct 5 | Oct 10 |
| 32°F | Sep 23 | Sep 27 | Sep 30 | Oct 2 | Oct 5 | Oct 9 | Oct 12 | Oct 16 | Oct 21 |
| 28°F | Oct 1 | Oct 7 | Oct 11 | Oct 16 | Oct 19 | Oct 22 | Oct 25 | Oct 29 | Nov 2 |
| 24°F | Oct 16 | Oct 21 | Oct 24 | Oct 28 | Oct 30 | Nov 1 | Nov 4 | Nov 7 | Nov 12 |
| 20°F | Oct 25 | Oct 30 | Nov 1 | Nov 3 | Nov 6 | Nov 8 | Nov 11 | Nov 14 | Nov 19 |
| 16°F | Nov 1 | Nov 5 | Nov 7 | Nov 10 | Nov 13 | Nov 15 | Nov 18 | Nov 22 | Nov 27 |
Freeze probabilities 1991–2020 at Kimball 3N, 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 55302 →Compare Annandale with another place →
Weather by month in Annandale
July is the warmest month at Kimball 3N, MN, averaging 79°F by day and 60°F at night; January is the coldest at 20°F and 3°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 57% of years.
Warmth for growing adds up to 2,254 growing degree days a year (base 50°F), fewer than at 63% of the 142 Minnesota stations. 32% of them (720) have built up by the end of June, and July adds the most, 607.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 20 | 3 | 100% | 31 | 0 |
| Feb | 25 | 6 | 100% | 28 | 0 |
| Mar | 37 | 19 | 100% | 26 | 6 |
| Apr | 53 | 32 | 100% | 16 | 39 |
| May | 66 | 45 | 57% | 2 | 212 |
| Jun | 76 | 55 | 0% | 0 | 463 |
| Jul | 79 | 60 | 0% | 0 | 607 |
| Aug | 78 | 57 | 0% | 0 | 539 |
| Sep | 71 | 49 | 31% | <1 | 307 |
| Oct | 56 | 37 | 99% | 11 | 77 |
| Nov | 39 | 23 | 100% | 24 | 4 |
| Dec | 25 | 11 | 100% | 31 | 0 |
Monthly normals 1991–2020 at Kimball 3N, MN (1,160 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Buffalo 2NE, MN, 14 miles east of Annandale and 168 feet lower, has a last frost 2 days earlier (April 30), a first frost 4 days later (October 9), a season 7 days longer.
When it snows in Annandale, Minnesota
The first measurable snow (0.1 inch or more) in Annandale usually arrives around November 13, and the last of the season around April 9. Those are the middle dates across the winters of 1991–2020 at Buffalo 2NE, MN, 13.9 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 55302
| When | What to do |
|---|---|
| February 21 – March 7 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 7 – March 21 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 4 – April 18 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| May 2 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 13 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by September 21 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 5 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 55302 is 12 miles from Kimball 3N, MN, which stands at 1,160 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 55302 in zone 4b, the band where the coldest night of the year averaged -25 to -20°F (-31.7 to -28.9°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.