Frost dates · USDA zone 6b
Frost dates for Dearborn Heights, MI
Dearborn Heights, MI sees its last 32 °F night of spring around May 1 and its first of fall around October 15 — a 166-day freeze-free season in a typical year.
Pick a sauce; the Plan Builder runs this station's dates and hands back the calendar, plant count and gear list.
Freeze odds, by date
| Odds | Last spring freeze after | First fall freeze before |
|---|---|---|
| 9 years in 10 | Apr 17 | Oct 28 |
| Median — 1 year in 2 | May 1 | Oct 15 |
| 1 year in 10 | May 18 | Oct 1 |
The top row is the risky edge: in 9 years of 10 a spring freeze still comes after it, so tender transplants set out then need cover. The bottom row is the cautious date — only 1 year in 10 freezes after it — and the one to plan uncovered tender transplants against. Freeze-free season: 166 days median, at least 147 in 9 years of 10, at least 186 days in 1 year of 10. NOAA ranks season length year by year, so it is not the gap between two rows above. A hard freeze (28 °F) has a median last date of Apr 20 and first of Oct 28.
Dearborn Heights planting calendar, 2027
Every row runs from the median last frost (May 1) and median first frost (Oct 15) above, using each cultivar's days to maturity. Same engine as the Plan Builder.
| Crop | Start indoors | Transplant / plant | First harvest | Days |
|---|---|---|---|---|
| Hardneck GarlicSiberian (porcelain hardneck) | — | Oct 15prior fall | Jun 12 | 240 from sow |
| Spanish OnionYellow Sweet Spanish (long-day) | Feb 6 | Apr 3 | Jul 22 | 110 from transplant |
| Mustard greensGarnet Giant (Brassica juncea) | Direct sow | May 1 | May 31 | 30 from sow |
| CilantroSlow Bolt (Coriandrum sativum) | Apr 17 | Apr 17 | Jun 1 | 45 from sow |
| Genovese BasilGenovese | Apr 3 | May 15 | Jul 14 | 60 from transplant |
| CayenneLong Slim Cayenne (Capsicum annuum) | Mar 6 | May 8 | Jul 22 | 75 from transplant |
| HabaneroOrange Habanero (Capsicum chinense) | Feb 20 | May 15 | Aug 18 | 95 from transplant |
| JalapeñoEarly Jalapeño (Capsicum annuum) | Mar 6 | May 8 | Jul 22 | 75 from transplant |
| Marconi Red PepperMarconi Red (Capsicum annuum) | Mar 6 | May 8 | Jul 27 | 80 from transplant |
| SerranoSerrano Tampiqueño (Capsicum annuum) | Mar 6 | May 8 | Jul 27 | 80 from transplant |
| Nantes CarrotScarlet Nantes | Apr 17 | Apr 17 | Jun 26 | 70 from sow |
| TomatilloToma Verde | Mar 20 | May 8 | Jul 17 | 70 from transplant |
| Roma TomatoRoma VF (determinate paste) | Mar 20 | May 8 | Jul 22 | 75 from transplant |
| San Marzano TomatoSan Marzano (indeterminate paste) | Mar 20 | May 8 | Jul 27 | 80 from transplant |
Tight means first harvest lands within two weeks of the median first fall frost: start that crop indoors on time or cover it in fall.
What sauce can Dearborn Heights grow?
Each sauce, scheduled for a Dearborn Heights container garden: when the first seeds go in and when enough fruit has ripened for one batch.
Dearborn Heights frost questions
When is the last frost in Dearborn Heights, MI?
The median last 32 °F freeze at DEARBORN, MI is May 1: half of years see a later one. One year in ten, a freeze still comes after May 18; nine years in ten, it comes after April 17. Source: NOAA NCEI 1991–2020 U.S. Climate Normals.
When is the first frost in Dearborn Heights, MI?
The median first 32 °F freeze of fall is October 15. One year in ten it arrives before October 1; nine years in ten, before October 28.
How long is the growing season in Dearborn Heights, MI?
166 days between the last spring and first fall 32 °F freeze in a median year. Nine years in ten the season runs at least 147 days; one year in ten, at least 186 days.
What growing zone is Dearborn Heights, MI?
USDA hardiness zone 6b, per the 2023 USDA Plant Hardiness Zone Map for ZIP 48127. A zone describes the coldest winter night, not when frost ends, so it is the wrong number for a planting calendar — the frost dates on this page are the right one.
When should I plant tomatoes in Dearborn Heights, MI?
Start Roma VF (determinate paste) seeds indoors around Mar 20 and transplant around May 8, 1 week after the median last frost. To cut the freeze risk to one year in ten, wait for May 18. First ripe fruit lands around Jul 22.
When should I plant peppers in Dearborn Heights, MI?
Sow jalapeño indoors on a heat mat around Mar 6; transplant no earlier than May 8, and wait past it until nights hold above 50 °F — that can run weeks later. First green pods around Jul 22.
Nearby in Michigan
- Dearbornlast frost Apr 27
- Westlandlast frost May 1
- Livonialast frost May 1
- Taylorlast frost Apr 20
- Southfieldlast frost May 1
- Detroitlast frost Apr 27
All Michigan frost dates → · How frost-date math drives a sowing calendar →