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

Planting zone for 04230 — East Poland, ME

ZIP code 04230 (East Poland, Androscoggin County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 3 and the first fall frost October 7.

Where ZIP 04230 is

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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostMay 3
First frostOct 7
2012 zone5b

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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for East Poland, ME…

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 East Poland, ME

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 3median — 50% chance of a later frost
Safe for tender plantsMay 16only 10% chance of frost after
First fall frostOctober 7median — 10% chance by Sep 27
Growing season157 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 21 and returns around October 22.

From the NOAA station Poland, ME — 4 miles away, elevation 571 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 04230

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 22 – Apr 5
SpinachSow outdoors · Mar 22 – Apr 12
Broccoli, cabbageStart indoors · Feb 22 – Mar 8
Broccoli, cabbageTransplant · Apr 12 – Apr 26
Onion setsPlant outdoors · Apr 5 – Apr 19
PotatoesPlant outdoors · Apr 12 – Apr 26
LettuceSow outdoors · Apr 5 – Apr 19
Carrots, beetsSow outdoors · Apr 12 – Apr 26
TomatoesStart indoors · Mar 8 – Mar 22
TomatoesTransplant · May 10 – May 24
Peppers, eggplantStart indoors · Feb 22 – Mar 8
Peppers, eggplantTransplant · May 17 – May 31
BeansSow outdoors · May 10 – May 24
Sweet cornSow outdoors · May 10 – May 24
Cucumbers, squashSow outdoors · May 10 – May 24
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 3) 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 04230 came on Apr 16 — 5 days earlier than the 1991–2020 average (Apr 21).

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 5b in Maine

493 plants native to the lower 48 states, recorded in Maine, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. Each links to its USDA PLANTS profile.

Trees 55

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 98

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falpine bearberry0.5 ft · blooms early spring · medium shade tolerance · to −62 °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 °F

Wildflowers & perennials 169

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 alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °F

Grasses 153

alpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °FAmerican beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °FAmerican cupscale3 ft · blooms early summer · high shade tolerance · to −18 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °F

Vines 6

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °Ftrumpet honeysuckle16 ft · blooms late summer · low shade tolerance · to −33 °FVirginia creeper1 ft · blooms late spring · medium shade tolerance · to −28 °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 East Poland, ME.

Soil in East Poland, ME

The soil mapped at the center of ZIP 04230 is Adams — loamy sand, somewhat excessively drained.

TextureLoamy sanddrains and warms fast; dries out and needs more feeding
pH4.8strongly acidic; most vegetables like 6.0–7.0
DrainageSomewhat excessively drainednatural drainage class
Organic matter3.5%moderate
Hydrologic groupAwater soaks in fast
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Adams loamy sand, 0 to 8 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 04230; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in East Poland, ME

Summer high78 °Faverage high, July
Winter low11 °Faverage low, January
Hot days4days a year at 90 °F or more
Freezing nights156nights a year at 32 °F or less
Growing degree days1,979base 50 °F — the season’s usable heat
Longest day15 h 30 mindaylight on June 21
Shortest day8 h 53 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation49.2 inper year, rain and melted snow
Snowfall80 inper year; 100 days with snow on the ground

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 27 °F, low 11 °F 27°11° JanFebruary: average high 30 °F, low 12 °F 30°12° FebMarch: average high 38 °F, low 21 °F 38°21° MarApril: average high 52 °F, low 32 °F 52°32° AprMay: average high 64 °F, low 43 °F 64°43° MayJune: average high 73 °F, low 52 °F 73°52° JunJuly: average high 78 °F, low 59 °F 78°59° JulAugust: average high 77 °F, low 57 °F 77°57° AugSeptember: average high 69 °F, low 48 °F 69°48° SepOctober: average high 56 °F, low 38 °F 56°38° OctNovember: average high 44 °F, low 28 °F 44°28° NovDecember: average high 34 °F, low 18 °F 34°18° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.11 in precipitation, 18 in snowfall 3.1❄18 JanFebruary: 3.00 in precipitation, 20.5 in snowfall 3.0❄21 FebMarch: 3.67 in precipitation, 14.8 in snowfall 3.7❄15 MarApril: 4.38 in precipitation, 4.2 in snowfall 4.4❄4 AprMay: 3.70 in precipitation, 0.1 in snowfall 3.7 MayJune: 4.92 in precipitation 4.9 JunJuly: 4.00 in precipitation 4.0 JulAugust: 3.91 in precipitation 3.9 AugSeptember: 3.96 in precipitation 4.0 SepOctober: 5.94 in precipitation, 1.4 in snowfall 5.9❄1 OctNovember: 4.42 in precipitation, 3.8 in snowfall 4.4❄4 NovDecember: 4.20 in precipitation, 17.3 in snowfall 4.2❄17 Dec

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

Nearby ZIP codes

All 8 nearest ZIP codes share zone 5b.

042235b
Danville, ME · 3 mi
042745b
Poland, ME · 3 mi
042105b
Auburn, ME · 4 mi
042565b
Mechanic Falls, ME · 5 mi
042585b
Minot, ME · 5 mi
042915b
West Poland, ME · 6 mi
042605b
New Gloucester, ME · 7 mi
042885b
West Minot, ME · 8 mi

Maine planting zones →

Questions about 04230

What planting zone is ZIP code 04230?

ZIP code 04230 (East Poland, ME) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in East Poland, ME?

The median last spring frost (32 °F) near 04230 is May 3; after May 16 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Poland station.

When is the first frost in East Poland, ME?

The median first fall frost near 04230 is October 7, giving a median frost-free growing season of 157 days.

When should I plant tomatoes in 04230?

Start tomato seeds indoors around Mar 8 – Mar 22 and set transplants outside around May 10 – May 24, one to three weeks after the median last frost.

How much rain and snow does 04230 get?

About 49.2 inches of precipitation a year and 80 inches of snowfall (NOAA 1991–2020 normals, Poland station).

How hot do summers get in East Poland, ME?

The average high peaks at 78 °F in July, with about 4 days a year at 90 °F or more.

What kind of soil does 04230 have?

The USDA soil survey maps Adams at the center of ZIP 04230: loamy sand, somewhat excessively drained, pH about 4.8 (strongly acidic).

Did spring come early in East Poland, ME in 2026?

Spring leaf-out near 04230 came on Apr 16 in 2026, 5 days earlier than the 1991–2020 average (Apr 21), according to the USA National Phenology Network Spring Index.

What kind of onions grow in East Poland, ME?

Long-day onions: the longest day near 04230 is 15 h 30 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).