Frost dates for Monroe, Michigan
Half of years have their last spring frost by April 23 — but 1 year in 10 still frosts after May 7.
Every other site gives you one date. A frost date is not a date: it is a percentile from 30 years of records at a nearby weather station, and planting to the median means losing the crop in half of years. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
- Frost this late in 1 year in 10
- May 7
- 1 year in 5
- May 2
- 3 years in 10
- April 29
- 2 years in 5
- April 25
- Half of years (the median)
- April 23
First fall freeze
- Freeze this early in 1 year in 10
- October 9
- 1 year in 5
- October 14
- 3 years in 10
- October 18
- 2 years in 5
- October 21
- Half of years (the median)
- October 23
- Growing season
- about 182 days
- Hardiness zones nearby
- 6a, 6b
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, station Monroe (USC00205563), at 41.91, -83.42. These are that station's own records, unshifted. The further your garden is from it, the less exactly they describe your ground — the planner resolves the nearest station to your own ZIP and lowers its confidence with distance, rather than presenting one number as if it were measured in your yard.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a hundred metres away does not. No table can know that about your garden. Your own logged frosts eventually can.
ZIP codes nearest this station
43412, 43434, 43460, 43465, 43468, 43604, 43605, 43608, 43610, 43611, 43612, 43616, 43619, 43620, 48117, 48133, 48140, 48145, 48157, 48159, 48161, 48162, 48166, 48177, 48179, 48182.
What can I plant here, and when? →
Nearby stations
The nearest stations, and how their last-frost dates compare — the frost gradient across your area, which no single station shows.
- Detroit Metro Ap, MI — last frost by April 20
- Blissfield 1Nne, MI — last frost by April 29
- Fremont Ag Stn, OH — last frost by April 21
- Grosse Pointe Farms, MI — last frost by April 29
- Hoytville 2 Ne, OH — last frost by April 24
- Pontiac Wwtp, MI — last frost by April 26
Other stations in Michigan.
- Jackson Reynolds Fld, MI — last frost by May 1
- Linden Wwtp, MI — last frost by May 3
- Greenville 2 Nne, MI — last frost by May 18
- Kent City 2 Sw, MI — last frost by May 14