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

Planting zone for 49289 — Weston, MI

ZIP code 49289 (Weston, Lenawee County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is May 4 and the first fall frost October 7.

Where ZIP 49289 is

Outlined: the ZIP code area · 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
Coldest night−23.3 to −20.6 °C
Last frostMay 4
First frostOct 7
2012 zone6a

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Weston, 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 Weston, MI

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 4median — 50% chance of a later frost
Safe for tender plantsMay 19only 10% chance of frost after
First fall frostOctober 7median — 10% chance by Sep 24
Growing season156 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 25 and returns around October 20.

From the NOAA station Morenci, MI — 7 miles away, elevation 771 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 49289

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 23 – Apr 6
SpinachSow outdoors · Mar 23 – Apr 13
Broccoli, cabbageStart indoors · Feb 23 – Mar 9
Broccoli, cabbageTransplant · Apr 13 – Apr 27
Onion setsPlant outdoors · Apr 6 – Apr 20
PotatoesPlant outdoors · Apr 13 – Apr 27
LettuceSow outdoors · Apr 6 – Apr 20
Carrots, beetsSow outdoors · Apr 13 – Apr 27
TomatoesStart indoors · Mar 9 – Mar 23
TomatoesTransplant · May 11 – May 25
Peppers, eggplantStart indoors · Feb 23 – Mar 9
Peppers, eggplantTransplant · May 18 – Jun 1
BeansSow outdoors · May 11 – May 25
Sweet cornSow outdoors · May 11 – May 25
Cucumbers, squashSow outdoors · May 11 – May 25
Fall lettuce, spinachSow outdoors · Aug 12 – Aug 26
GarlicPlant cloves · Sep 23 – Oct 28
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 4) and first fall frost (Oct 7) 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 49289 came on Mar 30 — 9 days earlier than the 1991–2020 average (Apr 8).

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 Weston, MI.

Soil in Weston, MI

The soil mapped at the center of ZIP 49289 is Griffin — loam, somewhat poorly drained.

TextureLoama good balance for most vegetables
pH7.2neutral; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter3.5%moderate
Hydrologic groupB/Dmoderate when drained; wet otherwise
Farmland classPrime farmland if protected from flooding or not frequently flooded during the growing seasonUSDA classification

Map unit: Griffin and Genesee loams, 0 to 3 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 49289; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Weston, MI

Summer high86 °Faverage high, July
Winter low15 °Faverage low, January
Hot days19days a year at 90 °F or more
Freezing nights148nights a year at 32 °F or less
Growing degree days2,727base 50 °F — the season’s usable heat
Longest day15 h 13 mindaylight on June 21
Shortest day9 h 08 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation38.1 inper year, rain and melted snow
Snowfall32 inper year; 46 days with snow on the ground

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 33 °F, low 15 °F 33°15° JanFebruary: average high 36 °F, low 16 °F 36°16° FebMarch: average high 47 °F, low 24 °F 47°24° MarApril: average high 60 °F, low 34 °F 60°34° AprMay: average high 72 °F, low 46 °F 72°46° MayJune: average high 82 °F, low 56 °F 82°56° JunJuly: average high 86 °F, low 58 °F 86°58° JulAugust: average high 83 °F, low 56 °F 83°56° AugSeptember: average high 76 °F, low 49 °F 76°49° SepOctober: average high 63 °F, low 38 °F 63°38° OctNovember: average high 49 °F, low 29 °F 49°29° NovDecember: average high 37 °F, low 20 °F 37°20° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 2.33 in precipitation, 9.8 in snowfall 2.3❄10 JanFebruary: 2.33 in precipitation, 8.1 in snowfall 2.3❄8 FebMarch: 2.77 in precipitation, 5.2 in snowfall 2.8❄5 MarApril: 3.58 in precipitation, 0.8 in snowfall 3.6❄1 AprMay: 4.05 in precipitation 4.0 MayJune: 3.84 in precipitation 3.8 JunJuly: 3.82 in precipitation 3.8 JulAugust: 3.76 in precipitation 3.8 AugSeptember: 3.14 in precipitation 3.1 SepOctober: 2.95 in precipitation 3.0 OctNovember: 3.04 in precipitation, 1.5 in snowfall 3.0❄2 NovDecember: 2.48 in precipitation, 6.6 in snowfall 2.5❄7 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Morenci, MI (7 mi away); precipitation: Morenci, MI (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

492796a
Sand Creek, MI · <1 mi
492486a
Jasper, MI · 5 mi
435336a
Lyons, OH · 6 mi
492566a
Morenci, MI · 6 mi
492356a
Clayton, MI · 8 mi
492216a
Adrian, MI · 9 mi
435406a
Metamora, OH · 10 mi
492686a
Palmyra, MI · 11 mi

Michigan planting zones →

Questions about 49289

What planting zone is ZIP code 49289?

ZIP code 49289 (Weston, MI) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Weston, MI?

The median last spring frost (32 °F) near 49289 is May 4; after May 19 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Morenci station.

When is the first frost in Weston, MI?

The median first fall frost near 49289 is October 7, giving a median frost-free growing season of 156 days.

When should I plant tomatoes in 49289?

Start tomato seeds indoors around Mar 9 – Mar 23 and set transplants outside around May 11 – May 25, one to three weeks after the median last frost.

How much rain and snow does 49289 get?

About 38.1 inches of precipitation a year and 32 inches of snowfall (NOAA 1991–2020 normals, Morenci station).

How hot do summers get in Weston, MI?

The average high peaks at 86 °F in July, with about 19 days a year at 90 °F or more.

What kind of soil does 49289 have?

The USDA soil survey maps Griffin at the center of ZIP 49289: loam, somewhat poorly drained, pH about 7.2 (neutral).

Did spring come early in Weston, MI in 2026?

Spring leaf-out near 49289 came on Mar 30 in 2026, 9 days earlier than the 1991–2020 average (Apr 8), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Weston, MI?

Long-day onions: the longest day near 49289 is 15 h 13 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).