USDA Hardiness Zone 6a
Frost Dates for 44865 — Plymouth, Ohio
NOAA 1991–2020 normals from Mansfield Lahm Municipal Airport, OH (1,295 ft), 15 miles southeast.
Updated
In Plymouth, the last spring frost (32°F) is around April 26 in half of years and has passed by May 12 in nine years out of ten. The first fall frost comes around October 22, as early as October 6 one year in ten, leaving a typical freeze-free season of 177 days (NOAA, Mansfield Lahm Municipal Airport, OH).
- Last spring frost
- April 26
- First fall frost
- October 22
- Growing season
- 177 days
- Hardiness zone
- 6a
50% probability
50% probability
freeze-free, 50%
-10 to -5°F (-23.3 to -20.6°C) coldest night
- First snow
- November 14
- Last snow
- April 7
- Winters with snow
- 100%
- Snow per year
- 49.2"
median, 1991–2020
median, 1991–2020
30 of 30 observed
NOAA normal
Frost risk by date in Plymouth
Half of springs at Mansfield Lahm Municipal Airport, OH see their last 32°F night by April 26; only one in ten is past it by April 14, and one in ten still has one after May 12. Planting tender crops after May 2 leaves a 30% risk of a frost on them, after May 6 20%, and after May 12 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 53% of the 148 Ohio stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 22 in half of years, as early as October 6 one year in ten, and holds off past November 4 one year in ten. A hard freeze of 28°F follows 11 days later, around November 2; in spring the one-in-ten date for 28°F is May 2, 10 days before the 32°F one. The freeze-free season lasts 177 days in a typical year, shorter than at 61% of the 148 Ohio stations; it reaches 198 days one year in ten and falls short of 158 one year in ten. On average 124 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 6, and return around October 9. Severe cold of 16°F or below comes every winter, usually between December 4 and March 15.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 22 | Apr 26 | Apr 30 | May 2 | May 6 | May 9 | May 13 | May 17 | May 22 |
| 32°F | Apr 14 | Apr 18 | Apr 20 | Apr 23 | Apr 26 | Apr 29 | May 2 | May 6 | May 12 |
| 28°F | Apr 1 | Apr 5 | Apr 9 | Apr 13 | Apr 16 | Apr 19 | Apr 21 | Apr 25 | May 2 |
| 24°F | Mar 18 | Mar 24 | Mar 29 | Mar 31 | Apr 3 | Apr 5 | Apr 9 | Apr 14 | Apr 19 |
| 20°F | Mar 9 | Mar 14 | Mar 18 | Mar 21 | Mar 24 | Mar 28 | Mar 31 | Apr 3 | Apr 8 |
| 16°F | Feb 26 | Mar 4 | Mar 8 | Mar 12 | Mar 15 | Mar 18 | Mar 21 | Mar 25 | Mar 30 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 26 | Oct 1 | Oct 4 | Oct 6 | Oct 9 | Oct 11 | Oct 15 | Oct 18 | Oct 23 |
| 32°F | Oct 6 | Oct 12 | Oct 15 | Oct 19 | Oct 22 | Oct 24 | Oct 27 | Oct 31 | Nov 4 |
| 28°F | Oct 19 | Oct 24 | Oct 28 | Oct 31 | Nov 2 | Nov 4 | Nov 8 | Nov 11 | Nov 15 |
| 24°F | Nov 1 | Nov 4 | Nov 7 | Nov 10 | Nov 12 | Nov 15 | Nov 18 | Nov 23 | Nov 29 |
| 20°F | Nov 8 | Nov 13 | Nov 16 | Nov 20 | Nov 24 | Nov 27 | Dec 1 | Dec 6 | Dec 12 |
| 16°F | Nov 16 | Nov 22 | Nov 27 | Dec 1 | Dec 4 | Dec 8 | Dec 12 | Dec 18 | Dec 23 |
Freeze probabilities 1991–2020 at Mansfield Lahm Municipal Airport, OH, 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 44865 →Compare Plymouth with another place →
Weather by month in Plymouth
July is the warmest month at Mansfield Lahm Municipal Airport, OH, averaging 83°F by day and 62°F at night; January is the coldest at 34°F and 19°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 34% of years.
Warmth for growing adds up to 3,047 growing degree days a year (base 50°F), fewer than at 74% of the 148 Ohio stations. 35% of them (1,058) have built up by the end of June, and July adds the most, 699. Precipitation totals 42.6 inches a year, most in June (4.8") and least in February (2.5"); May to September bring 47% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 34 | 19 | 3.2 | 100% | 27 | 3 |
| Feb | 37 | 21 | 2.5 | 100% | 24 | 5 |
| Mar | 47 | 29 | 3.3 | 100% | 21 | 30 |
| Apr | 60 | 39 | 4.3 | 99% | 8 | 117 |
| May | 71 | 50 | 4.2 | 34% | 1 | 334 |
| Jun | 79 | 59 | 4.8 | 0% | 0 | 570 |
| Jul | 83 | 62 | 3.9 | 0% | 0 | 699 |
| Aug | 81 | 61 | 3.6 | 0% | 0 | 651 |
| Sep | 75 | 54 | 3.4 | 3% | 0 | 433 |
| Oct | 63 | 43 | 3.2 | 82% | 4 | 165 |
| Nov | 50 | 33 | 3.2 | 100% | 15 | 35 |
| Dec | 39 | 25 | 3.0 | 100% | 25 | 6 |
Monthly normals 1991–2020 at Mansfield Lahm Municipal Airport, OH (1,295 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, Mansfield 5 W, OH, 16 miles south of Plymouth, has a last frost 4 days later (April 30), a first frost 7 days earlier (October 15), a season 10 days shorter.
When it snows in Plymouth, Ohio
The first measurable snow (0.1 inch or more) in Plymouth usually arrives around November 14, and the last of the season around April 7. Those are the middle dates across the winters of 1991–2020 at Mansfield Lahm Municipal Airport, OH, 14.6 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 19 days after the last snow.
Planting calendar for 44865
| When | What to do |
|---|---|
| February 15 – March 1 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 1 – March 15 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 29 – April 12 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 26 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 30 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 8 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 22 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 44865 is 15 miles from Mansfield Lahm Municipal Airport, OH, which stands at 1,295 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 6 other ZIP codes share the station; its figures are presented in full for 44903 (Mansfield). The 2023 USDA Plant Hardiness Zone Map lists ZIP 44865 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.
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.