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

Planting zone for 49085 — Saint Joseph, MI

ZIP code 49085 (Saint Joseph, Berrien County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is May 5 and the first fall frost October 15.

Where ZIP 49085 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.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostMay 5
First frostOct 15
2012 zone6a

Was 6a on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Saint Joseph, 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 Saint Joseph, MI

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 5median — 50% chance of a later frost
Safe for tender plantsMay 26only 10% chance of frost after
First fall frostOctober 15median — 10% chance by Sep 28
Growing season161 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 25 and returns around October 30.

From the NOAA station Benton Harbor Airport, MI — 5 miles away, elevation 627 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 49085

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 24 – Apr 7
SpinachSow outdoors · Mar 24 – Apr 14
Broccoli, cabbageStart indoors · Feb 24 – Mar 10
Broccoli, cabbageTransplant · Apr 14 – Apr 28
Onion setsPlant outdoors · Apr 7 – Apr 21
PotatoesPlant outdoors · Apr 14 – Apr 28
LettuceSow outdoors · Apr 7 – Apr 21
Carrots, beetsSow outdoors · Apr 14 – Apr 28
TomatoesStart indoors · Mar 10 – Mar 24
TomatoesTransplant · May 12 – May 26
Peppers, eggplantStart indoors · Feb 24 – Mar 10
Peppers, eggplantTransplant · May 19 – Jun 2
BeansSow outdoors · May 12 – May 26
Sweet cornSow outdoors · May 12 – May 26
Cucumbers, squashSow outdoors · May 12 – May 26
Fall lettuce, spinachSow outdoors · Aug 20 – Sep 3
GarlicPlant cloves · Oct 1 – Nov 5
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 5) and first fall frost (Oct 15) 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 49085 came on Mar 26 — 13 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 6b in Michigan

582 plants native to the lower 48 states, recorded in Michigan, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. 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 221

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 175

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 °Fautumn bluegrass1.5 ft · blooms late spring · medium shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °Fbeaked sedge4 ft · blooms late spring · low shade tolerance · to −38 °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 Saint Joseph, MI.

Soil in Saint Joseph, MI

The soil mapped at the center of ZIP 49085 is Blount — loam, somewhat poorly drained.

TextureLoama good balance for most vegetables
pH6.7neutral; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter2.5%moderate
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classPrime farmland if drainedUSDA classification

Map unit: Blount loam, 0 to 4 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 49085; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Saint Joseph, MI

Summer high83 °Faverage high, July
Winter low20 °Faverage low, January
Hot days18days a year at 90 °F or more
Freezing nights128nights a year at 32 °F or less
Growing degree days2,955base 50 °F — the season’s usable heat
Longest day15 h 15 mindaylight on June 21
Shortest day9 h 06 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation40.7 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 33 °F, low 20 °F 33°20° JanFebruary: average high 36 °F, low 21 °F 36°21° FebMarch: average high 47 °F, low 28 °F 47°28° MarApril: average high 59 °F, low 37 °F 59°37° AprMay: average high 70 °F, low 47 °F 70°47° MayJune: average high 80 °F, low 57 °F 80°57° JunJuly: average high 83 °F, low 62 °F 83°62° JulAugust: average high 81 °F, low 60 °F 81°60° AugSeptember: average high 76 °F, low 54 °F 76°54° SepOctober: average high 63 °F, low 44 °F 63°44° OctNovember: average high 49 °F, low 34 °F 49°34° NovDecember: average high 38 °F, low 25 °F 38°25° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 2.86 in precipitation 2.9 JanFebruary: 2.37 in precipitation 2.4 FebMarch: 2.51 in precipitation 2.5 MarApril: 3.54 in precipitation 3.5 AprMay: 3.91 in precipitation 3.9 MayJune: 3.58 in precipitation 3.6 JunJuly: 3.64 in precipitation 3.6 JulAugust: 4.90 in precipitation 4.9 AugSeptember: 3.45 in precipitation 3.5 SepOctober: 4.40 in precipitation 4.4 OctNovember: 3.16 in precipitation 3.2 NovDecember: 2.34 in precipitation 2.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Benton Harbor Airport, MI (5 mi away); precipitation: Stevensville 1se, MI (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

3 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

490236b
Benton Harbor, MI · 4 mi
491276b
Stevensville, MI · 5 mi
491266a
Sodus, MI · 5 mi
490226b
Benton Harbor, MI · 6 mi
491016b
Baroda, MI · 8 mi
491036a
Berrien Springs, MI · 9 mi
491116a
Eau Claire, MI · 9 mi
491066b
Bridgman, MI · 9 mi

Michigan planting zones →

Questions about 49085

What planting zone is ZIP code 49085?

ZIP code 49085 (Saint Joseph, MI) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Saint Joseph, MI?

The median last spring frost (32 °F) near 49085 is May 5; after May 26 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Benton Harbor Airport station.

When is the first frost in Saint Joseph, MI?

The median first fall frost near 49085 is October 15, giving a median frost-free growing season of 161 days.

When should I plant tomatoes in 49085?

Start tomato seeds indoors around Mar 10 – Mar 24 and set transplants outside around May 12 – May 26, one to three weeks after the median last frost.

How much rain and snow does 49085 get?

About 40.7 inches of precipitation a year (NOAA 1991–2020 normals, Stevensville 1se station).

How hot do summers get in Saint Joseph, MI?

The average high peaks at 83 °F in July, with about 18 days a year at 90 °F or more.

What kind of soil does 49085 have?

The USDA soil survey maps Blount at the center of ZIP 49085: loam, somewhat poorly drained, pH about 6.7 (neutral).

Did spring come early in Saint Joseph, MI in 2026?

Spring leaf-out near 49085 came on Mar 26 in 2026, 13 days earlier than the 1991–2020 average (Apr 8), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Saint Joseph, MI?

Long-day onions: the longest day near 49085 is 15 h 15 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 49085 change?

Yes. The 2012 USDA map put 49085 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.