USDA Hardiness Zone 6b
Frost Dates for 43724 — Caldwell, Ohio
NOAA 1991–2020 normals from Caldwell 3SE, OH (880 ft), 4 miles southeast.
Updated
In Caldwell, the last spring frost (32°F) is around April 30 in half of years and has passed by May 20 in nine years out of ten. The first fall frost comes around October 14, as early as September 30 one year in ten, leaving a typical freeze-free season of 167 days (NOAA, Caldwell 3SE, OH).
- Last spring frost
- April 30
- First fall frost
- October 14
- Growing season
- 167 days
- Hardiness zone
- 6b
50% probability
50% probability
freeze-free, 50%
-5 to 0°F (-20.6 to -17.8°C) coldest night
- First snow
- December 11
- Last snow
- March 5
- Winters with snow
- 100%
- Snow per year
- 15.7"
median, 1991–2020
median, 1991–2020
18 of 18 observed
NOAA normal
Frost risk by date in Caldwell
Half of springs at Caldwell 3SE, OH see their last 32°F night by April 30; only one in ten is past it by April 15, and one in ten still has one after May 20. Planting tender crops after May 8 leaves a 30% risk of a frost on them, after May 13 20%, and after May 20 10%. The 20 days between the even-odds date and the one-in-ten date is wider than at 98% of the 148 Ohio stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 14 in half of years, as early as September 30 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 13 days later, around October 27; in spring the one-in-ten date for 28°F is May 8, 12 days before the 32°F one. The freeze-free season lasts 167 days in a typical year, shorter than at 87% of the 148 Ohio stations; it reaches 190 days one year in ten and falls short of 145 one year in ten. On average 126 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 12 days longer, to about May 12, and return around October 3. Severe cold of 16°F or below comes every winter, usually between December 1 and March 15.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 26 | Apr 30 | May 5 | May 8 | May 12 | May 16 | May 19 | May 23 | May 29 |
| 32°F | Apr 15 | Apr 21 | Apr 26 | Apr 28 | Apr 30 | May 5 | May 8 | May 13 | May 20 |
| 28°F | Apr 1 | Apr 7 | Apr 12 | Apr 16 | Apr 19 | Apr 24 | Apr 26 | Apr 30 | May 8 |
| 24°F | Mar 22 | Mar 28 | Mar 31 | Apr 3 | Apr 6 | Apr 9 | Apr 13 | Apr 16 | Apr 23 |
| 20°F | Mar 10 | Mar 16 | Mar 19 | Mar 22 | Mar 25 | Mar 28 | Apr 1 | Apr 3 | Apr 9 |
| 16°F | Feb 26 | Mar 4 | Mar 8 | Mar 12 | Mar 15 | Mar 18 | Mar 20 | Mar 24 | Mar 30 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 20 | Sep 24 | Sep 27 | Sep 30 | Oct 3 | Oct 5 | Oct 9 | Oct 13 | Oct 18 |
| 32°F | Sep 30 | Oct 3 | Oct 7 | Oct 11 | Oct 14 | Oct 18 | Oct 22 | Oct 26 | Nov 1 |
| 28°F | Oct 9 | Oct 15 | Oct 20 | Oct 24 | Oct 27 | Oct 31 | Nov 2 | Nov 5 | Nov 10 |
| 24°F | Oct 23 | Oct 28 | Nov 1 | Nov 3 | Nov 5 | Nov 9 | Nov 12 | Nov 15 | Nov 21 |
| 20°F | Nov 2 | Nov 6 | Nov 10 | Nov 13 | Nov 16 | Nov 20 | Nov 24 | Nov 29 | Dec 6 |
| 16°F | Nov 13 | Nov 19 | Nov 23 | Nov 27 | Dec 1 | Dec 5 | Dec 9 | Dec 15 | Dec 23 |
Freeze probabilities 1991–2020 at Caldwell 3SE, 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 43724 →Compare Caldwell with another place →
Weather by month in Caldwell
July is the warmest month at Caldwell 3SE, OH, averaging 82°F by day and 62°F at night; January is the coldest at 39°F and 20°F. A freezing night is all but certain in every month from November 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 48% of years.
Warmth for growing adds up to 3,016 growing degree days a year (base 50°F), fewer than at 78% of the 148 Ohio stations. 35% of them (1,065) have built up by the end of June, and July adds the most, 677.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 39 | 20 | 100% | 26 | 4 |
| Feb | 42 | 22 | 100% | 24 | 4 |
| Mar | 53 | 28 | 100% | 20 | 35 |
| Apr | 64 | 38 | 96% | 8 | 137 |
| May | 73 | 48 | 48% | 1 | 336 |
| Jun | 80 | 57 | 2% | 0 | 549 |
| Jul | 82 | 62 | 0% | 0 | 677 |
| Aug | 82 | 59 | 0% | 0 | 640 |
| Sep | 77 | 52 | 11% | 0 | 428 |
| Oct | 66 | 41 | 89% | 5 | 168 |
| Nov | 54 | 32 | 100% | 16 | 28 |
| Dec | 44 | 25 | 100% | 25 | 9 |
Monthly normals 1991–2020 at Caldwell 3SE, OH (880 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, Beverly Stp, OH, 14 miles south of Caldwell and 256 feet lower, has a last frost 6 days earlier (April 24), a first frost 8 days later (October 22), a season 11 days longer.
When it snows in Caldwell, Ohio
The first measurable snow (0.1 inch or more) in Caldwell usually arrives around December 11, and the last of the season around March 5. Those are the middle dates across the winters of 1991–2020 at Beverly Stp, OH, 14.5 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 56 days after the last snow.
Planting calendar for 43724
| When | What to do |
|---|---|
| February 19 – March 5 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 5 – March 19 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 2 – April 16 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 30 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 22 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by September 30 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 14 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 43724 is 4 miles from Caldwell 3SE, OH, which stands at 880 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 43724 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°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.