When is the last frost in Fairfield, OH?

The average last spring frost (50% probability of 32°F) in Fairfield is around April 19, based on NOAA/NCEI 1991–2020 normals at the Fairfield, OH station (2.5 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Fairfield?

The average first fall frost in Fairfield, OH is around October 22, giving roughly a 186-day frost-free growing season.

What planting zone is Fairfield, OH?

Fairfield is in USDA plant hardiness zone 6b (average annual extreme minimum temperature -5 to 0°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Fairfield?

In Fairfield, OH the warmest month is July (avg high 87.3°F) and the coldest is January (avg low 20.8°F). It averages about 45″ of precipitation a year.

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Fairfield, OH Planting Calendar & Frost Dates

USDA hardiness zone 6b · ZIP 45014 · elevation 175′ · NOAA & USDA data

Fairfield is in USDA hardiness zone 6b (winters can dip to -5 to 0°F), with a growing season of about 186 days between the average last spring frost (April 19) and first fall frost (October 22). The warmest month is July (avg high 87.3°F); the coldest is January (avg low 20.8°F). It averages 45″ of precipitation a year. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp -5 to 0°F

Last spring frost

April 19

avg (50% prob, 32°F)

First fall frost

October 22

avg (50% prob, 32°F)

Growing season

186 days

frost-free window

Warmest month

July

avg high 87.3°F

Month-by-month typical weather in Fairfield

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Fairfield, OH (2.5 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	38.2	20.8	29.5	3.4	–
February	42.4	23	32.7	3	–
March	52.8	30.9	41.8	3.9	–
April	65.7	40.7	53.2	4.9	–
May	75.4	51.6	63.5	4.9	–
June	83.5	60.8	72.2	4.4	–
July	87.3	64.6	75.9	3.9	–
August	86.6	62.7	74.7	3.5	–
September	79.9	55	67.5	3.3	–
October	67.4	42.9	55.1	3.3	–
November	53.7	32.5	43.1	3.2	–
December	42.5	25.8	34.2	3.5	–

What to plant when in Fairfield

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 8 · Transplant out: April 26
Peppers	warm	Start seeds indoors: February 22 · Transplant out: May 3
Cucumbers	warm	Direct sow: April 26
Zucchini / squash	warm	Direct sow: April 26
Bush beans	warm	Direct sow: April 26
Sweet corn	warm	Direct sow: April 26
Basil	warm	Transplant out: April 26
Peas	cool	Sow (spring): March 15 · Sow (fall): August 27
Spinach	cool	Sow (spring): March 8 · Sow (fall): August 27
Lettuce	cool	Sow (spring): March 22 · Sow (fall): August 27
Kale	cool	Transplant (spring): March 29 · Sow (fall): August 13
Broccoli	cool	Transplant (spring): April 5
Carrots	cool	Sow (spring): March 29 · Sow (fall): August 13
Onions	cool	Transplant (spring): March 22
Potatoes	cool	Plant seed potatoes: April 5
Radishes	cool	Sow (spring): March 22 · Sow (fall): September 10

Dates are computed from Fairfield's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in Ohio

Hamilton, OH Cincinnati, OH Middletown, OH Dayton, OH Springfield, OH Grove City, OH Dublin, OH Columbus, OH

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Fairfield, OH, 2.5 mi (confidence: high). Monthly weather normals: Fairfield, OH, 2.5 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.