Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for New Haven, MI

New Haven, MI is in USDA zone 6a across its 2 ZIP codes. The median last spring frost is April 30 and the first fall frost October 24.

New Haven on the zone map

Outlined: its 2 ZIP code areas · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone6a−10 to −5 °F
ZIP codes2
Last frostApr 30
First frostOct 24
Growing season174 days

6a 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for New Haven, MI…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in New Haven, MI

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 30median — 50% chance of a later frost
Safe for tender plantsMay 15only 10% chance of frost after
First fall frostOctober 24median — 10% chance by Oct 7
Growing season174 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 18 and returns around November 3.

From the NOAA station Mt Clemens Ang Base, MI, elevation 581 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in New Haven

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 19 – Apr 2
SpinachSow outdoors · Mar 19 – Apr 9
Broccoli, cabbageStart indoors · Feb 19 – Mar 5
Broccoli, cabbageTransplant · Apr 9 – Apr 23
Onion setsPlant outdoors · Apr 2 – Apr 16
PotatoesPlant outdoors · Apr 9 – Apr 23
LettuceSow outdoors · Apr 2 – Apr 16
Carrots, beetsSow outdoors · Apr 9 – Apr 23
TomatoesStart indoors · Mar 5 – Mar 19
TomatoesTransplant · May 7 – May 21
Peppers, eggplantStart indoors · Feb 19 – Mar 5
Peppers, eggplantTransplant · May 14 – May 28
BeansSow outdoors · May 7 – May 21
Sweet cornSow outdoors · May 7 – May 21
Cucumbers, squashSow outdoors · May 7 – May 21
Fall lettuce, spinachSow outdoors · Aug 29 – Sep 12
GarlicPlant cloves · Oct 10 – Nov 14
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 30) and first fall frost (Oct 24) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 48050 came on Apr 7 — 5 days earlier than the 1991–2020 average (Apr 12).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Native plants for zone 6a in Michigan

580 plants native to the lower 48 states, recorded in Michigan, and rated by the USDA to survive −10 °F or colder — the bottom of zone 6a. Each links to its USDA PLANTS profile.

Trees 58

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 105

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °F

Wildflowers & perennials 220

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °F

Grasses 174

alpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °FAmerican beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °Fbeaked sedge4 ft · blooms late spring · low shade tolerance · to −38 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °F

Vines 8

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °Ftrumpet creeper2 ft · blooms summer · high shade tolerance · to −13 °F

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in New Haven, MI.

Soil in New Haven, MI

The soil mapped at the center of ZIP 48050 is Ziegenfuss — clay, poorly drained.

TextureClayholds water and nutrients; slow to drain and warm up
pH7.0neutral; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter4.5%moderate
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classPrime farmland if drainedUSDA classification

Map unit: Ziegenfuss clay, 0 to 1 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 48050; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in New Haven, MI

Summer high83 °Faverage high, July
Winter low16 °Faverage low, January
Hot days14days a year at 90 °F or more
Freezing nights143nights a year at 32 °F or less
Growing degree days2,709base 50 °F — the season’s usable heat
Longest day15 h 20 mindaylight on June 21
Shortest day9 h 02 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation35.9 inper year, rain and melted snow
Snowfall47 inper year; 61 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 30 °F, low 16 °F 30°16° JanFebruary: average high 33 °F, low 16 °F 33°16° FebMarch: average high 42 °F, low 25 °F 42°25° MarApril: average high 56 °F, low 36 °F 56°36° AprMay: average high 69 °F, low 47 °F 69°47° MayJune: average high 78 °F, low 58 °F 78°58° JunJuly: average high 83 °F, low 62 °F 83°62° JulAugust: average high 80 °F, low 59 °F 80°59° AugSeptember: average high 73 °F, low 52 °F 73°52° SepOctober: average high 60 °F, low 41 °F 60°41° OctNovember: average high 47 °F, low 32 °F 47°32° NovDecember: average high 35 °F, low 23 °F 35°23° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″January: 2.37 in precipitation, 10.8 in snowfall 2.4❄11 JanFebruary: 1.92 in precipitation, 13.3 in snowfall 1.9❄13 FebMarch: 2.09 in precipitation, 6.1 in snowfall 2.1❄6 MarApril: 3.19 in precipitation, 2.6 in snowfall 3.2❄3 AprMay: 3.81 in precipitation 3.8 MayJune: 3.56 in precipitation 3.6 JunJuly: 3.94 in precipitation 3.9 JulAugust: 3.27 in precipitation 3.3 AugSeptember: 3.46 in precipitation 3.5 SepOctober: 2.95 in precipitation 3.0 OctNovember: 2.97 in precipitation, 3.5 in snowfall 3.0❄4 NovDecember: 2.37 in precipitation, 10.3 in snowfall 2.4❄10 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Richmond 4 Nnw, MI (6 mi away); precipitation: Richmond 4 Nnw, MI (6 mi away). Daylight is calculated from latitude.

ZIP codes in New Haven

480486a
−10 to −5 °F
480506a
−10 to −5 °F

Michigan planting zones →

Questions about New Haven

What planting zone is New Haven, MI?

New Haven, MI is in USDA hardiness zone 6a on the 2023 map (6a: −10 to −5 °F).

When is the last frost in New Haven, MI?

The median last spring frost is April 30 and the median first fall frost is October 24 (NOAA 1991–2020 normals, Mt Clemens Ang Base station).

When can I plant a garden in New Haven, MI?

Cool-season crops like peas and spinach go in around Mar 19 – Apr 9; tomatoes, peppers, beans and squash after about May 7, once frost risk has passed.

What kind of onions grow in New Haven, MI?

Long-day onions: the longest day is 15 h 20 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

How much rain and snow does New Haven, MI get?

About 35.9 inches of precipitation a year and 47 inches of snowfall (NOAA 1991–2020 normals).