USDA Hardiness Zone 6b
Frost Dates for 45030 — Harrison, Ohio
NOAA 1991–2020 normals from Cheviot 3 W, OH (853 ft), 9 miles southeast.
Updated
In Harrison, the last spring frost (32°F) is around April 16 in half of years and has passed by May 3 in nine years out of ten. The first fall frost comes around October 28, as early as October 14 one year in ten, leaving a typical freeze-free season of 193 days (NOAA, Cheviot 3 W, OH).
- Last spring frost
- April 16
- First fall frost
- October 28
- Growing season
- 193 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 19
- Last snow
- March 10
- Winters with snow
- 100%
- Snow per year
- 11.4"
median, 1991–2020
median, 1991–2020
20 of 20 observed
NOAA normal
Frost risk by date in Harrison
Half of springs at Cheviot 3 W, OH see their last 32°F night by April 16; only one in ten is past it by April 2, and one in ten still has one after May 3. Planting tender crops after April 23 leaves a 30% risk of a frost on them, after April 28 20%, and after May 3 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 24% of the 148 Ohio stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 28 in half of years, as early as October 14 one year in ten, and holds off past November 9 one year in ten. A hard freeze of 28°F follows 10 days later, around November 7; in spring the one-in-ten date for 28°F is April 21, 12 days before the 32°F one. The freeze-free season lasts 193 days in a typical year, longer than at 91% of the 148 Ohio stations; it reaches 214 days one year in ten and falls short of 172 one year in ten. On average 103 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 April 28, and return around October 17. Severe cold of 16°F or below comes every winter, usually between December 12 and March 3.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 13 | Apr 18 | Apr 21 | Apr 24 | Apr 28 | May 1 | May 4 | May 8 | May 14 |
| 32°F | Apr 2 | Apr 6 | Apr 9 | Apr 12 | Apr 16 | Apr 19 | Apr 23 | Apr 28 | May 3 |
| 28°F | Mar 20 | Mar 26 | Mar 30 | Apr 2 | Apr 4 | Apr 6 | Apr 10 | Apr 14 | Apr 21 |
| 24°F | Mar 9 | Mar 14 | Mar 18 | Mar 21 | Mar 24 | Mar 28 | Mar 31 | Apr 3 | Apr 7 |
| 20°F | Feb 22 | Mar 2 | Mar 7 | Mar 11 | Mar 14 | Mar 17 | Mar 20 | Mar 24 | Mar 29 |
| 16°F | Feb 7 | Feb 16 | Feb 23 | Feb 28 | Mar 3 | Mar 6 | Mar 11 | Mar 15 | Mar 20 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 4 | Oct 9 | Oct 12 | Oct 15 | Oct 17 | Oct 20 | Oct 22 | Oct 25 | Oct 29 |
| 32°F | Oct 14 | Oct 20 | Oct 23 | Oct 26 | Oct 28 | Oct 31 | Nov 1 | Nov 4 | Nov 9 |
| 28°F | Oct 26 | Nov 1 | Nov 2 | Nov 4 | Nov 7 | Nov 10 | Nov 13 | Nov 17 | Nov 24 |
| 24°F | Nov 3 | Nov 8 | Nov 13 | Nov 16 | Nov 19 | Nov 23 | Nov 27 | Dec 1 | Dec 7 |
| 20°F | Nov 13 | Nov 18 | Nov 23 | Nov 28 | Dec 1 | Dec 5 | Dec 9 | Dec 15 | Dec 22 |
| 16°F | Nov 24 | Nov 30 | Dec 3 | Dec 8 | Dec 12 | Dec 17 | Dec 22 | Dec 27 | Jan 1 |
Freeze probabilities 1991–2020 at Cheviot 3 W, 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 45030 →Compare Harrison with another place →
Compared with the next station
The nearest other station, Cincinnati-Fernbank, OH, 11 miles south of Harrison and 353 feet lower, has a last frost 3 days earlier (April 13), a first frost 3 days later (October 31), a season 4 days longer.
When it snows in Harrison, Ohio
The first measurable snow (0.1 inch or more) in Harrison usually arrives around December 19, and the last of the season around March 10. Those are the middle dates across the winters of 1991–2020 at Cincinnati-Fernbank, OH, 10.5 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 37 days after the last snow.
Planting calendar for 45030
| When | What to do |
|---|---|
| February 5 – February 19 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 19 – March 5 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 19 – April 2 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 16 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 5 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 14 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 28 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 45030 is 9 miles from Cheviot 3 W, OH, which stands at 853 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 45030 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.