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

Planting zone for 48166 — Newport, MI

ZIP code 48166 (Newport, Monroe County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 27 and the first fall frost October 22.

Where ZIP 48166 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 frostApr 27
First frostOct 22
2012 zone6b

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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Newport, 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 Newport, MI

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 27median — 50% chance of a later frost
Safe for tender plantsMay 12only 10% chance of frost after
First fall frostOctober 22median — 10% chance by Oct 8
Growing season177 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 15 and returns around November 3.

From the NOAA station Newport 4sse, MI — 2 miles away, elevation 577 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 48166

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 16 – Mar 30
SpinachSow outdoors · Mar 16 – Apr 6
Broccoli, cabbageStart indoors · Feb 16 – Mar 2
Broccoli, cabbageTransplant · Apr 6 – Apr 20
Onion setsPlant outdoors · Mar 30 – Apr 13
PotatoesPlant outdoors · Apr 6 – Apr 20
LettuceSow outdoors · Mar 30 – Apr 13
Carrots, beetsSow outdoors · Apr 6 – Apr 20
TomatoesStart indoors · Mar 2 – Mar 16
TomatoesTransplant · May 4 – May 18
Peppers, eggplantStart indoors · Feb 16 – Mar 2
Peppers, eggplantTransplant · May 11 – May 25
BeansSow outdoors · May 4 – May 18
Sweet cornSow outdoors · May 4 – May 18
Cucumbers, squashSow outdoors · May 4 – May 18
Fall lettuce, spinachSow outdoors · Aug 27 – Sep 10
GarlicPlant cloves · Oct 8 – Nov 12
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 27) and first fall frost (Oct 22) 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 48166 came on Mar 31 — 7 days earlier than the 1991–2020 average (Apr 7).

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 Newport, MI.

Soil in Newport, MI

The soil mapped at the center of ZIP 48166 is Fulton — silty clay loam, somewhat poorly drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up
pH7.2neutral; 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: Fulton silty clay loam, 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 48166; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Newport, MI

Summer high83 °Faverage high, July
Winter low18 °Faverage low, January
Hot days13days a year at 90 °F or more
Freezing nights125nights a year at 32 °F or less
Growing degree days2,827base 50 °F — the season’s usable heat
Longest day15 h 14 mindaylight on June 21
Shortest day9 h 07 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation33.3 inper year, rain and melted snow
Snowfall41 inper year; 48 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 32 °F, low 18 °F 32°18° JanFebruary: average high 34 °F, low 19 °F 34°19° FebMarch: average high 43 °F, low 27 °F 43°27° MarApril: average high 56 °F, low 37 °F 56°37° AprMay: average high 68 °F, low 48 °F 68°48° MayJune: average high 78 °F, low 58 °F 78°58° JunJuly: average high 83 °F, low 62 °F 83°62° JulAugust: average high 82 °F, low 60 °F 82°60° AugSeptember: average high 75 °F, low 54 °F 75°54° SepOctober: average high 62 °F, low 43 °F 62°43° OctNovember: average high 48 °F, low 33 °F 48°33° NovDecember: average high 37 °F, low 25 °F 37°25° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″January: 2.12 in precipitation, 12.4 in snowfall 2.1❄12 JanFebruary: 1.82 in precipitation, 13.5 in snowfall 1.8❄14 FebMarch: 2.38 in precipitation, 5.5 in snowfall 2.4❄6 MarApril: 2.88 in precipitation, 0.6 in snowfall 2.9❄1 AprMay: 3.64 in precipitation 3.6 MayJune: 3.32 in precipitation 3.3 JunJuly: 3.22 in precipitation 3.2 JulAugust: 3.56 in precipitation 3.6 AugSeptember: 3.13 in precipitation 3.1 SepOctober: 2.56 in precipitation 2.6 OctNovember: 2.54 in precipitation, 1 in snowfall 2.5❄1 NovDecember: 2.13 in precipitation, 8.2 in snowfall 2.1❄8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Newport 4sse, MI (2 mi away); precipitation: Newport 4sse, MI (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

481796b
South Rockwood, MI · 4 mi
481736b
Rockwood, MI · 7 mi
481626b
Monroe, MI · 7 mi
481176b
Carleton, MI · 7 mi
481346b
Flat Rock, MI · 8 mi
481836b
Trenton, MI · 11 mi
481616b
Monroe, MI · 11 mi
481646b
New Boston, MI · 11 mi

Michigan planting zones →

Questions about 48166

What planting zone is ZIP code 48166?

ZIP code 48166 (Newport, 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 Newport, MI?

The median last spring frost (32 °F) near 48166 is April 27; after May 12 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Newport 4sse station.

When is the first frost in Newport, MI?

The median first fall frost near 48166 is October 22, giving a median frost-free growing season of 177 days.

When should I plant tomatoes in 48166?

Start tomato seeds indoors around Mar 2 – Mar 16 and set transplants outside around May 4 – May 18, one to three weeks after the median last frost.

How much rain and snow does 48166 get?

About 33.3 inches of precipitation a year and 41 inches of snowfall (NOAA 1991–2020 normals, Newport 4sse station).

How hot do summers get in Newport, MI?

The average high peaks at 83 °F in July, with about 13 days a year at 90 °F or more.

What kind of soil does 48166 have?

The USDA soil survey maps Fulton at the center of ZIP 48166: silty clay loam, somewhat poorly drained, pH about 7.2 (neutral).

Did spring come early in Newport, MI in 2026?

Spring leaf-out near 48166 came on Mar 31 in 2026, 7 days earlier than the 1991–2020 average (Apr 7), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Newport, MI?

Long-day onions: the longest day near 48166 is 15 h 14 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).