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

Planting zone for 04441 — Greenville, ME

ZIP code 04441 (Greenville, Piscataquis County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is May 7 and the first fall frost October 9.

Where ZIP 04441 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.

Zone4a−30 to −25 °F
Coldest night−34.4 to −31.7 °C
Last frostMay 7
First frostOct 9
2012 zone4a

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 4a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Greenville, 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 Greenville, ME

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 7median — 50% chance of a later frost
Safe for tender plantsMay 20only 10% chance of frost after
First fall frostOctober 9median — 10% chance by Sep 27
Growing season153 daysfrost-free, median

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

From the NOAA station Greenville Maine Forestry Svc, ME — 21 miles away, elevation 1,037 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 04441

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 26 – Apr 9
SpinachSow outdoors · Mar 26 – Apr 16
Broccoli, cabbageStart indoors · Feb 26 – Mar 12
Broccoli, cabbageTransplant · Apr 16 – Apr 30
Onion setsPlant outdoors · Apr 9 – Apr 23
PotatoesPlant outdoors · Apr 16 – Apr 30
LettuceSow outdoors · Apr 9 – Apr 23
Carrots, beetsSow outdoors · Apr 16 – Apr 30
TomatoesStart indoors · Mar 12 – Mar 26
TomatoesTransplant · May 14 – May 28
Peppers, eggplantStart indoors · Feb 26 – Mar 12
Peppers, eggplantTransplant · May 21 – Jun 4
BeansSow outdoors · May 14 – May 28
Sweet cornSow outdoors · May 14 – May 28
Cucumbers, squashSow outdoors · May 14 – May 28
Fall lettuce, spinachSow outdoors · Aug 14 – Aug 28
GarlicPlant cloves · Sep 25 – Oct 30
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 7) and first fall frost (Oct 9) 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 04441 came on May 7 — about the same time as the 1991–2020 average (May 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 4a in Maine

387 plants native to the lower 48 states, recorded in Maine, and rated by the USDA to survive −30 °F or colder — the bottom of zone 4a. Each links to its USDA PLANTS profile.

Trees 48

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 69

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 133

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 licorice4 ft · blooms late spring · medium shade tolerance · to −38 °F

Grasses 125

alpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °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 °FBebb's sedge3 ft · blooms late spring · low shade tolerance · to −38 °FBicknell's sedge3 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 4

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 °Ftrumpet honeysuckle16 ft · blooms late summer · low shade tolerance · to −33 °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 Greenville, ME.

Soil in Greenville, ME

The soil mapped at the center of ZIP 04441 is Peru — moderately decomposed plant material, moderately well drained.

TextureModerately decomposed plant materialtop layer
DrainageModerately well drainednatural drainage class
Organic matter71%high
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Peru-Colonel-Rawsonville association, 3 to 15 percent slopes, very stony.

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 04441; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Greenville, ME

Summer high75 °Faverage high, July
Winter low5 °Faverage low, January
Hot days1days a year at 90 °F or more
Freezing nights171nights a year at 32 °F or less
Growing degree days1,698base 50 °F — the season’s usable heat
Longest day15 h 43 mindaylight on June 21
Shortest day8 h 41 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation44.5 inper year, rain and melted snow

Average high and low, by month

−10°0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 23 °F, low 5 °F 23°5° JanFebruary: average high 25 °F, low 7 °F 25°7° FebMarch: average high 34 °F, low 17 °F 34°17° MarApril: average high 46 °F, low 30 °F 46°30° AprMay: average high 62 °F, low 41 °F 62°41° MayJune: average high 70 °F, low 51 °F 70°51° JunJuly: average high 75 °F, low 57 °F 75°57° JulAugust: average high 74 °F, low 56 °F 74°56° AugSeptember: average high 66 °F, low 48 °F 66°48° SepOctober: average high 53 °F, low 37 °F 53°37° OctNovember: average high 39 °F, low 27 °F 39°27° NovDecember: average high 28 °F, low 15 °F 28°15° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 2.98 in precipitation 3.0 JanFebruary: 2.41 in precipitation 2.4 FebMarch: 3.19 in precipitation 3.2 MarApril: 3.59 in precipitation 3.6 AprMay: 3.59 in precipitation 3.6 MayJune: 4.04 in precipitation 4.0 JunJuly: 4.01 in precipitation 4.0 JulAugust: 3.96 in precipitation 4.0 AugSeptember: 3.44 in precipitation 3.4 SepOctober: 5.00 in precipitation 5.0 OctNovember: 3.96 in precipitation 4.0 NovDecember: 4.33 in precipitation 4.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Greenville Maine Forestry Svc, ME (21 mi away); precipitation: Greenville Maine Forestry Svc, ME (21 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

044145a
Brownville, ME · 22 mi
044784b
Rockwood, ME · 22 mi
044424b
Greenville Junction, ME · 24 mi
044155a
Brownville Junction, ME · 26 mi
044855a
Shirley Mills, ME · 27 mi
044625a
Millinocket, ME · 28 mi
044645a
Monson, ME · 29 mi
044435a
Guilford, ME · 31 mi

Maine planting zones →

Questions about 04441

What planting zone is ZIP code 04441?

ZIP code 04441 (Greenville, ME) is in USDA hardiness zone 4a on the 2023 map: the coldest night of an average winter reaches −30 to −25 °F (−34.4 to −31.7 °C).

When is the last frost in Greenville, ME?

The median last spring frost (32 °F) near 04441 is May 7; after May 20 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Greenville Maine Forestry Svc station.

When is the first frost in Greenville, ME?

The median first fall frost near 04441 is October 9, giving a median frost-free growing season of 153 days.

When should I plant tomatoes in 04441?

Start tomato seeds indoors around Mar 12 – Mar 26 and set transplants outside around May 14 – May 28, one to three weeks after the median last frost.

How much rain and snow does 04441 get?

About 44.5 inches of precipitation a year (NOAA 1991–2020 normals, Greenville Maine Forestry Svc station).

How hot do summers get in Greenville, ME?

The average high peaks at 75 °F in July, with about 1 days a year at 90 °F or more.

What kind of soil does 04441 have?

The USDA soil survey maps Peru at the center of ZIP 04441: moderately decomposed plant material, moderately well drained.

Did spring come early in Greenville, ME in 2026?

Spring leaf-out near 04441 came on May 7 in 2026, about the same as the 1991–2020 average (May 8), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Greenville, ME?

Long-day onions: the longest day near 04441 is 15 h 43 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).