USDA Hardiness Zone 4b
Frost Dates for 54755 — Mondovi, Wisconsin
NOAA 1991–2020 normals from Mondovi, WI (830 ft), 2 miles southeast.
Updated
In Mondovi, the last spring frost (32°F) is around May 10 in half of years and has passed by May 25 in nine years out of ten. The first fall frost comes around October 2, as early as September 19 one year in ten, leaving a typical freeze-free season of 144 days (NOAA, Mondovi, WI).
- Last spring frost
- May 10
- First fall frost
- October 2
- Growing season
- 144 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 9
- Last snow
- April 12
- Winters with snow
- 100%
- Snow per year
- 53.2"
median, 1991–2020
median, 1991–2020
30 of 30 observed
NOAA normal
Frost risk by date in Mondovi
Half of springs at Mondovi, WI see their last 32°F night by May 10; only one in ten is past it by April 27, and one in ten still has one after May 25. Planting tender crops after May 16 leaves a 30% risk of a frost on them, after May 19 20%, and after May 25 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 30% of the 182 Wisconsin 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 19 one year in ten, and holds off past October 13 one year in ten. A hard freeze of 28°F follows 7 days later, around October 9; in spring the one-in-ten date for 28°F is May 14, 11 days before the 32°F one. The freeze-free season lasts 144 days in a typical year, shorter than at 76% of the 182 Wisconsin stations; it reaches 163 days one year in ten and falls short of 125 one year in ten. On average 163 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 10 days longer, to about May 20, and return around September 23. Severe cold of 16°F or below comes every winter, usually between November 11 and March 31.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 7 | May 12 | May 15 | May 18 | May 20 | May 23 | May 26 | May 29 | Jun 2 |
| 32°F | Apr 27 | May 1 | May 5 | May 7 | May 10 | May 13 | May 16 | May 19 | May 25 |
| 28°F | Apr 15 | Apr 21 | Apr 24 | Apr 27 | Apr 30 | May 3 | May 5 | May 9 | May 14 |
| 24°F | Apr 4 | Apr 9 | Apr 12 | Apr 15 | Apr 18 | Apr 22 | Apr 25 | Apr 29 | May 4 |
| 20°F | Mar 26 | Mar 31 | Apr 3 | Apr 5 | Apr 8 | Apr 10 | Apr 14 | Apr 18 | Apr 23 |
| 16°F | Mar 15 | Mar 21 | Mar 26 | Mar 29 | Mar 31 | Apr 2 | Apr 5 | Apr 8 | Apr 13 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 9 | Sep 14 | Sep 17 | Sep 20 | Sep 23 | Sep 26 | Sep 29 | Oct 2 | Oct 5 |
| 32°F | Sep 19 | Sep 23 | Sep 27 | Sep 30 | Oct 2 | Oct 4 | Oct 6 | Oct 9 | Oct 13 |
| 28°F | Sep 27 | Oct 1 | Oct 4 | Oct 7 | Oct 9 | Oct 12 | Oct 15 | Oct 19 | Oct 24 |
| 24°F | Oct 7 | Oct 11 | Oct 15 | Oct 18 | Oct 21 | Oct 24 | Oct 27 | Oct 30 | Nov 5 |
| 20°F | Oct 17 | Oct 23 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 7 | Nov 10 | Nov 15 |
| 16°F | Oct 30 | Nov 2 | Nov 5 | Nov 8 | Nov 11 | Nov 14 | Nov 17 | Nov 21 | Nov 27 |
Freeze probabilities 1991–2020 at Mondovi, WI, 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 54755 →Compare Mondovi with another place →
Weather by month in Mondovi
July is the warmest month at Mondovi, WI, averaging 85°F by day and 60°F at night; January is the coldest at 27°F and 7°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 81% of years.
Warmth for growing adds up to 2,793 growing degree days a year (base 50°F), more than at 90% of the 182 Wisconsin stations. 34% of them (963) have built up by the end of June, and July adds the most, 697. Precipitation totals 36.1 inches a year, most in June (5.3") and least in January (1.1"); May to September bring 62% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 27 | 7 | 1.1 | 100% | 31 | 0 |
| Feb | 32 | 11 | 1.1 | 100% | 27 | 0 |
| Mar | 45 | 23 | 2.1 | 100% | 25 | 16 |
| Apr | 60 | 34 | 3.4 | 100% | 14 | 82 |
| May | 73 | 46 | 4.3 | 81% | 3 | 305 |
| Jun | 81 | 56 | 5.3 | 2% | 0 | 560 |
| Jul | 85 | 60 | 4.1 | 0% | 0 | 697 |
| Aug | 82 | 58 | 4.9 | 0% | 0 | 626 |
| Sep | 75 | 50 | 3.9 | 43% | 1 | 382 |
| Oct | 61 | 38 | 2.5 | 100% | 11 | 113 |
| Nov | 45 | 26 | 2.0 | 100% | 22 | 11 |
| Dec | 32 | 14 | 1.4 | 100% | 29 | 0 |
Monthly normals 1991–2020 at Mondovi, WI (830 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, Durand, WI, 15 miles west of Mondovi, has a last frost 9 days earlier (May 1), a first frost 8 days later (October 10), a season 18 days longer.
When it snows in Mondovi, Wisconsin
The first measurable snow (0.1 inch or more) in Mondovi usually arrives around November 9, and the last of the season around April 12. Those are the middle dates across the winters of 1991–2020 at Mondovi, WI, 1.6 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 28 days after the last snow.
Planting calendar for 54755
| When | What to do |
|---|---|
| March 1 – March 15 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 15 – March 29 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 12 – April 26 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| May 10 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 54755 is 2 miles from Mondovi, WI, which stands at 830 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 54755 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 Wisconsin →
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.