Frost dates for Dayton Mcd, Ohio
Half of years have their last spring frost by April 18, but 1 year in 10 still frosts after May 5.
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 5
- 1 year in 5
- April 30
- 3 years in 10
- April 25
- 2 years in 5
- April 21
- Half of years (the median)
- April 18
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- October 13
- 1 year in 5
- October 17
- 3 years in 10
- October 21
- 2 years in 5
- October 23
- Half of years (the median)
- October 25
- Growing season
- about 189 days
- Hardiness zones nearby
- 6a, 6b
- Summer days
- a usual high of about 30 °C85 °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 ~2 °C36 °F · low ~-7 °C20 °F · rain ~80 mm3.2 in
- February
- high ~5 °C40 °F · low ~-5 °C23 °F · rain ~60 mm2.4 in
- March
- high ~10 °C51 °F · low ~-1 °C31 °F · rain ~90 mm3.5 in
- April
- high ~18 °C64 °F · low ~5 °C41 °F · rain ~113 mm4.4 in
- May
- high ~24 °C75 °F · low ~12 °C53 °F · rain ~111 mm4.4 in
- June
- high ~29 °C84 °F · low ~17 °C62 °F · rain ~112 mm4.4 in
- July
- high ~30 °C87 °F · low ~19 °C66 °F · rain ~102 mm4 in
- August
- high ~30 °C86 °F · low ~18 °C64 °F · rain ~79 mm3.1 in
- September
- high ~26 °C79 °F · low ~13 °C56 °F · rain ~77 mm3 in
- October
- high ~19 °C66 °F · low ~6 °C44 °F · rain ~76 mm3 in
- November
- high ~11 °C52 °F · low ~1 °C33 °F · rain ~77 mm3 in
- December
- high ~5 °C41 °F · low ~-4 °C26 °F · rain ~80 mm3.1 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Dayton Mcd station (listed by NOAA as Dayton Mcd, USC00332067), at 39.76, -84.19. 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
45005, 45032, 45066, 45068, 45301, 45305, 45309, 45315, 45322, 45324, 45337, 45339…
+39 moreShow fewer
45341, 45342, 45345, 45354, 45361, 45370, 45371, 45377, 45383, 45384, 45385, 45402, 45403, 45404, 45405, 45406, 45409, 45410, 45414, 45415, 45416, 45417, 45418, 45419, 45420, 45424, 45426, 45428, 45429, 45430, 45431, 45432, 45433, 45434, 45439, 45440, 45449, 45458, 45459.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Eaton, OH, last frost by April 25
- Sidney 1 S, OH, last frost by April 27
- Milford, OH, last frost by April 23
- Cheviot 3 W, OH, last frost by April 16
- Cambridge City 3 N, IN, last frost by April 27
- Marysville, OH, last frost by April 19
Other stations in Ohio.
- Lima Wastewater Treatment Plant, OH, last frost by April 24
- Columbus-Valley Crossing, OH, last frost by April 23
- Hoytville 2 NE, OH, last frost by April 24
- New Lexington 2 NW, OH, last frost by April 30
- Fremont Ag Stn, OH, last frost by April 21
- Toledo Metcalf Field, OH, last frost by April 20
- Wooster 3 SSE, OH, last frost by April 24
- Caldwell 3 SE, OH, last frost by April 30
When do I plant? · Where the dates come from
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