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

Planting zone for 49449 — Pentwater, MI

ZIP code 49449 (Pentwater, Oceana County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is May 17 and the first fall frost October 7.

Where ZIP 49449 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 17
First frostOct 7
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 Pentwater, 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 Pentwater, MI

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 17median — 50% chance of a later frost
Safe for tender plantsJune 1only 10% chance of frost after
First fall frostOctober 7median — 10% chance by Sep 20
Growing season144 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 1 and returns around October 21.

From the NOAA station Ludington 4 Se, MI — 8 miles away, elevation 689 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 49449

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 5 – Apr 19
SpinachSow outdoors · Apr 5 – Apr 26
Broccoli, cabbageStart indoors · Mar 8 – Mar 22
Broccoli, cabbageTransplant · Apr 26 – May 10
Onion setsPlant outdoors · Apr 19 – May 3
PotatoesPlant outdoors · Apr 26 – May 10
LettuceSow outdoors · Apr 19 – May 3
Carrots, beetsSow outdoors · Apr 26 – May 10
TomatoesStart indoors · Mar 22 – Apr 5
TomatoesTransplant · May 24 – Jun 7
Peppers, eggplantStart indoors · Mar 8 – Mar 22
Peppers, eggplantTransplant · May 31 – Jun 14
BeansSow outdoors · May 24 – Jun 7
Sweet cornSow outdoors · May 24 – Jun 7
Cucumbers, squashSow outdoors · May 24 – Jun 7
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 17) 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 49449 came on Apr 11 — 5 days earlier than the 1991–2020 average (Apr 16).

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 Pentwater, MI.

Soil in Pentwater, MI

The soil mapped at the center of ZIP 49449 is Gowdy — loamy fine sand, well drained.

TextureLoamy fine sanddrains and warms fast; dries out and needs more feeding
pH6.2slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classprime farmlandUSDA classification

Map unit: Gowdy-Perrinton complex, 1 to 6 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 49449; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Pentwater, MI

Summer high79 °Faverage high, July
Winter low17 °Faverage low, January
Hot days5days a year at 90 °F or more
Freezing nights149nights a year at 32 °F or less
Growing degree days2,166base 50 °F — the season’s usable heat
Longest day15 h 28 mindaylight on June 21
Shortest day8 h 55 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation38.9 inper year, rain and melted snow
Snowfall79 inper year; 82 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 29 °F, low 17 °F 29°17° JanFebruary: average high 32 °F, low 18 °F 32°18° FebMarch: average high 41 °F, low 24 °F 41°24° MarApril: average high 54 °F, low 33 °F 54°33° AprMay: average high 67 °F, low 43 °F 67°43° MayJune: average high 76 °F, low 52 °F 76°52° JunJuly: average high 79 °F, low 58 °F 79°58° JulAugust: average high 78 °F, low 56 °F 78°56° AugSeptember: average high 71 °F, low 50 °F 71°50° SepOctober: average high 57 °F, low 40 °F 57°40° OctNovember: average high 45 °F, low 30 °F 45°30° NovDecember: average high 34 °F, low 22 °F 34°22° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 2.75 in precipitation, 26.4 in snowfall 2.8❄26 JanFebruary: 1.96 in precipitation, 20 in snowfall 2.0❄20 FebMarch: 2.37 in precipitation, 5.9 in snowfall 2.4❄6 MarApril: 3.63 in precipitation, 1.1 in snowfall 3.6❄1 AprMay: 4.45 in precipitation 4.5 MayJune: 3.72 in precipitation 3.7 JunJuly: 3.53 in precipitation 3.5 JulAugust: 3.27 in precipitation 3.3 AugSeptember: 3.23 in precipitation 3.2 SepOctober: 3.96 in precipitation, 0.1 in snowfall 4.0 OctNovember: 3.43 in precipitation, 5.4 in snowfall 3.4❄5 NovDecember: 2.60 in precipitation, 19.6 in snowfall 2.6❄20 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Ludington 4 Se, MI (8 mi away); precipitation: Hart 3 Wsw, MI (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

494206a
Hart, MI · 7 mi
494366b
Mears, MI · 8 mi
494546a
Scottville, MI · 12 mi
494316b
Ludington, MI · 12 mi
494056a
Custer, MI · 13 mi
494556a
Shelby, MI · 13 mi
494595b
Walkerville, MI · 15 mi
494586a
Walhalla, MI · 17 mi

Michigan planting zones →

Questions about 49449

What planting zone is ZIP code 49449?

ZIP code 49449 (Pentwater, 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 Pentwater, MI?

The median last spring frost (32 °F) near 49449 is May 17; after June 1 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Ludington 4 Se station.

When is the first frost in Pentwater, MI?

The median first fall frost near 49449 is October 7, giving a median frost-free growing season of 144 days.

When should I plant tomatoes in 49449?

Start tomato seeds indoors around Mar 22 – Apr 5 and set transplants outside around May 24 – Jun 7, one to three weeks after the median last frost.

How much rain and snow does 49449 get?

About 38.9 inches of precipitation a year and 79 inches of snowfall (NOAA 1991–2020 normals, Hart 3 Wsw station).

How hot do summers get in Pentwater, MI?

The average high peaks at 79 °F in July, with about 5 days a year at 90 °F or more.

What kind of soil does 49449 have?

The USDA soil survey maps Gowdy at the center of ZIP 49449: loamy fine sand, well drained, pH about 6.2 (slightly acidic).

Did spring come early in Pentwater, MI in 2026?

Spring leaf-out near 49449 came on Apr 11 in 2026, 5 days earlier than the 1991–2020 average (Apr 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Pentwater, MI?

Long-day onions: the longest day near 49449 is 15 h 28 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 49449 change?

Yes. The 2012 USDA map put 49449 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.