Frost dates for Lima Wastewater Treatment Plant, Ohio
Half of years have their last spring frost by April 24, but 1 year in 10 still frosts after May 11.
A frost date is really a percentile from 30 years of records at a nearby weather station: in about half of years a frost still comes after the median date. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
How often a frost still comes on or after each date.
- 1 year in 10
- May 11
- 1 year in 5
- May 4
- 3 years in 10
- April 30
- 2 years in 5
- April 28
- Half of years (the median)
- April 24
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- October 10
- 1 year in 5
- October 15
- 3 years in 10
- October 19
- 2 years in 5
- October 21
- Half of years (the median)
- October 24
- Growing season
- about 182 days
- Hardiness zone nearby
- 6a
- Summer days
- a usual high of about 28 °C82 °F
- Lettuce and spinach run to seed
- June to September, in hot, long days (how we know)
Summer and rain
A growing garden needs about 25 mm1 in of water a week, rain and watering together. Here is what a normal month brings.
Month by month
- January
- high ~1 °C34 °F · low ~-7 °C19 °F · rain ~72 mm2.8 in
- February
- high ~3 °C37 °F · low ~-6 °C21 °F · rain ~64 mm2.5 in
- March
- high ~9 °C48 °F · low ~-2 °C29 °F · rain ~77 mm3 in
- April
- high ~16 °C61 °F · low ~4 °C39 °F · rain ~101 mm4 in
- May
- high ~22 °C71 °F · low ~10 °C50 °F · rain ~111 mm4.4 in
- June
- high ~27 °C80 °F · low ~15 °C60 °F · rain ~109 mm4.3 in
- July
- high ~29 °C84 °F · low ~17 °C63 °F · rain ~111 mm4.4 in
- August
- high ~28 °C82 °F · low ~16 °C62 °F · rain ~96 mm3.8 in
- September
- high ~25 °C77 °F · low ~13 °C55 °F · rain ~81 mm3.2 in
- October
- high ~18 °C64 °F · low ~6 °C44 °F · rain ~74 mm2.9 in
- November
- high ~10 °C50 °F · low ~1 °C33 °F · rain ~80 mm3.1 in
- December
- high ~4 °C38 °F · low ~-4 °C24 °F · rain ~69 mm2.7 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Lima Wastewater Treatment Plant station (listed by NOAA as Lima Wwtp, USC00334551), at 40.72, -84.13. These are that station’s own records, unshifted. The further your garden is from it, the less exactly they describe your ground. The planner finds the nearest station to your garden and lowers its confidence with distance, so no number is presented as if it were measured in your garden.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a few hundred feet away does not. No table can know that about your garden. A few seasons of your own logged frosts can.
ZIP codes nearest this station
45801, 45804, 45805, 45806, 45807, 45808, 45809, 45817, 45819, 45820, 45830, 45833…
+17 moreShow fewer
45838, 45844, 45850, 45853, 45854, 45862, 45863, 45870, 45876, 45877, 45884, 45885, 45887, 45888, 45894, 45895, 45896.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Sidney 1 S, OH, last frost by April 27
- Hoytville 2 NE, OH, last frost by April 24
- Marysville, OH, last frost by April 19
- Fremont Ag Stn, OH, last frost by April 21
- Dayton Mcd, OH, last frost by April 18
- Toledo Metcalf Field, OH, last frost by April 20
Other stations in Ohio.
- Eaton, OH, last frost by April 25
- Columbus-Valley Crossing, OH, last frost by April 23
- Milford, OH, last frost by April 23
- Cheviot 3 W, OH, last frost by April 16
- Wooster 3 SSE, OH, last frost by April 24
- New Lexington 2 NW, OH, last frost by April 30
- Cleveland, OH, last frost by April 20
- Cleveland Burke Airport, OH, last frost by April 8
When do I plant? · Where the dates come from
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