USDA Hardiness Zone 6a

Frost Dates for 44820 — Bucyrus, Ohio

NOAA 1991–2020 normals from Bucyrus, OH (955 ft), under a mile south.

Updated October 28, 2026

In Bucyrus, the last spring frost (32°F) is around April 19 in half of years and has passed by May 6 in nine years out of ten. The first fall frost comes around October 27, as early as October 14 one year in ten, leaving a typical freeze-free season of 190 days (NOAA, Bucyrus, OH).

Last spring frost: April 19
First fall frost: October 27
Growing season: 190 days
Hardiness zone: 6a

First snow: November 26
Last snow: March 24
Winters with snow: 100%
Snow per year: 23.3"

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Frost risk by date in Bucyrus

Half of springs at Bucyrus, OH see their last 32°F night by April 19; only one in ten is past it by April 5, and one in ten still has one after May 6. Planting tender crops after April 25 leaves a 30% risk of a frost on them, after April 30 20%, and after May 6 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 27 in half of years, as early as October 14 one year in ten, and holds off past November 10 one year in ten. A hard freeze of 28°F follows 10 days later, around November 6; in spring the one-in-ten date for 28°F is April 22, 14 days before the 32°F one. The freeze-free season lasts 190 days in a typical year, longer than at 82% of the 148 Ohio stations; it reaches 210 days one year in ten and falls short of 169 one year in ten. On average 129 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 11 days longer, to about April 30, and return around October 15. Severe cold of 16°F or below comes every winter, usually between December 11 and March 6.

Spring: the chance of another night this cold after the date
Low	90%	80%	70%	60%	50%	40%	30%	20%	10%
36°F	Apr 16	Apr 20	Apr 24	Apr 27	Apr 30	May 3	May 7	May 11	May 16
32°F	Apr 5	Apr 10	Apr 14	Apr 17	Apr 19	Apr 22	Apr 25	Apr 30	May 6
28°F	Mar 23	Mar 30	Apr 1	Apr 3	Apr 7	Apr 11	Apr 15	Apr 18	Apr 22
24°F	Mar 12	Mar 17	Mar 21	Mar 25	Mar 28	Mar 31	Apr 2	Apr 6	Apr 11
20°F	Mar 1	Mar 6	Mar 11	Mar 14	Mar 17	Mar 20	Mar 23	Mar 28	Apr 1
16°F	Feb 17	Feb 25	Feb 28	Mar 3	Mar 6	Mar 9	Mar 13	Mar 17	Mar 24

Fall: the chance the first night this cold has come by the date
Low	10%	20%	30%	40%	50%	60%	70%	80%	90%
36°F	Oct 2	Oct 6	Oct 10	Oct 13	Oct 15	Oct 18	Oct 21	Oct 24	Oct 29
32°F	Oct 14	Oct 18	Oct 22	Oct 25	Oct 27	Oct 30	Nov 1	Nov 4	Nov 10
28°F	Oct 26	Oct 31	Nov 1	Nov 4	Nov 6	Nov 9	Nov 13	Nov 18	Nov 24
24°F	Nov 3	Nov 8	Nov 12	Nov 16	Nov 19	Nov 23	Nov 27	Dec 1	Dec 6
20°F	Nov 12	Nov 19	Nov 24	Nov 27	Dec 1	Dec 3	Dec 7	Dec 12	Dec 19
16°F	Nov 24	Nov 30	Dec 2	Dec 6	Dec 11	Dec 16	Dec 20	Dec 24	Dec 30

Freeze probabilities 1991–2020 at Bucyrus, 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 44820 →Compare Bucyrus with another place →

Frost risk through the year in Bucyrus

Frost curve for Bucyrus, Ohio (Bucyrus, OH, NOAA 1991–2020): the chance of another 32°F night falls from 90% on April 5 to 50% on April 19 and 10% on May 6; the chance that the first fall one has come rises from 10% on October 14 to 50% on October 27 and 90% on November 10. — In Bucyrus, the spring curve drops under 10% on May 6 and the fall curve passes 10% on October 14, 161 days later; that gap is longer than at 82% of the 148 Ohio stations with frost dates. The spring risk falls from 90% to 10% over 31 days (April 5 to May 6) and the fall risk climbs from 10% to 90% over 27 days (October 14 to November 10): both ends of the season vary about as much. At Galion Wtr Wks, OH, 11 miles southeast, the same gap runs from May 11 to October 7, 12 days shorter.

Chance of a frost after each planting date in Bucyrus
Planted on	Another 32°F night	28°F night
Apr 5	over 90%	55%
Apr 12	75%	38%
Apr 1950% date	50%	18%
Apr 26	28%	under 10%
May 3	15%	under 10%
May 10	under 10%	under 10%

Weather by month in Bucyrus

July is the warmest month at Bucyrus, OH, averaging 86°F by day and 64°F at night; January is the coldest at 35°F and 21°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 20% of years.

Warmth for growing adds up to 3,450 growing degree days a year (base 50°F), more than at 75% of the 148 Ohio stations. 35% of them (1,217) have built up by the end of June, and July adds the most, 770. Precipitation totals 38.7 inches a year, most in June (4.5") and least in February (2.1"); May to September bring 50% of it.

Monthly normals 1991–2020 at Bucyrus, OH
Month	High °F	Low °F	Precip. in	32°F night	Nights ≤ 32°F	GDD 50°F
Jan	35	21	2.8	100%	27	4
Feb	38	22	2.1	100%	25	3
Mar	49	30	2.5	100%	22	33
Apr	63	40	3.5	95%	9	141
May	74	51	4.0	20%	1	391
Jun	82	61	4.5	0%	0	645
Jul	86	64	4.2	0%	0	770
Aug	84	62	3.3	0%	0	716
Sep	78	55	3.4	0%	<1	501
Oct	65	44	2.9	65%	4	199
Nov	51	34	2.9	100%	16	41
Dec	40	27	2.6	100%	25	7

Monthly normals 1991–2020 at Bucyrus, OH (955 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, Galion Wtr Wks, OH, 11 miles southeast of Bucyrus and 215 feet higher, has a last frost 7 days later (April 26), a first frost 7 days earlier (October 20), a season 14 days shorter.

Frost dates for 44833 (Galion) →

When it snows in Bucyrus, Ohio

The first measurable snow (0.1 inch or more) in Bucyrus usually arrives around November 26, and the last of the season around March 24. Those are the middle dates across the winters of 1991–2020 at Bucyrus, OH, 0.2 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 26 days after the last snow.

Planting calendar for 44820

What to do and when, from the 50% frost dates for Bucyrus, Ohio
When	What to do
February 8 – February 22	Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out.
February 22 – March 8	Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early.
March 22 – April 5	Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil.
April 19 onward	Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast.
by August 4	Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops.
by October 13	Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation.
October 27 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 44820 is under a mile from Bucyrus, OH, which stands at 955 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 44820 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.

Frost dates across Ohio →

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.