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

Planting zone for 04631 — Eastport, ME

ZIP code 04631 (Eastport, Washington County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 29 and the first fall frost October 25.

Where ZIP 04631 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.

Zone6a−10 to −5 °F
Coldest night−23.3 to −20.6 °C
Last frostApr 29
First frostOct 25
2012 zone6a

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 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Eastport, 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 Eastport, ME

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 29median — 50% chance of a later frost
Safe for tender plantsMay 11only 10% chance of frost after
First fall frostOctober 25median — 10% chance by Oct 8
Growing season178 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 12 and returns around November 6.

From the NOAA station Eastport, ME — within 1 mile, elevation 85 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 04631

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 18 – Apr 1
SpinachSow outdoors · Mar 18 – Apr 8
Broccoli, cabbageStart indoors · Feb 18 – Mar 4
Broccoli, cabbageTransplant · Apr 8 – Apr 22
Onion setsPlant outdoors · Apr 1 – Apr 15
PotatoesPlant outdoors · Apr 8 – Apr 22
LettuceSow outdoors · Apr 1 – Apr 15
Carrots, beetsSow outdoors · Apr 8 – Apr 22
TomatoesStart indoors · Mar 4 – Mar 18
TomatoesTransplant · May 6 – May 20
Peppers, eggplantStart indoors · Feb 18 – Mar 4
Peppers, eggplantTransplant · May 13 – May 27
BeansSow outdoors · May 6 – May 20
Sweet cornSow outdoors · May 6 – May 20
Cucumbers, squashSow outdoors · May 6 – May 20
Fall lettuce, spinachSow outdoors · Aug 30 – Sep 13
GarlicPlant cloves · Oct 11 – Nov 15
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 29) and first fall frost (Oct 25) 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 04631 came on Apr 26 — about the same time as the 1991–2020 average (Apr 25).

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 6a in Maine

502 plants native to the lower 48 states, recorded in Maine, and rated by the USDA to survive −10 °F or colder — the bottom of zone 6a. 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 101

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 173

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 154

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 Eastport, ME.

Soil in Eastport, ME

The soil mapped at the center of ZIP 04631 is Scantic — silt loam, poorly drained.

TextureSilt loama good balance for most vegetables
pH6.0slightly acidic; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter6%high
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Scantic silt 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 04631; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Eastport, ME

Summer high75 °Faverage high, July
Winter low15 °Faverage low, January
Hot days1days a year at 90 °F or more
Freezing nights138nights a year at 32 °F or less
Growing degree days1,651base 50 °F — the season’s usable heat
Longest day15 h 36 mindaylight on June 21
Shortest day8 h 46 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation47.6 inper year, rain and melted snow
Snowfall62 inper year; 72 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 30 °F, low 15 °F 30°15° JanFebruary: average high 32 °F, low 17 °F 32°17° FebMarch: average high 39 °F, low 24 °F 39°24° MarApril: average high 50 °F, low 34 °F 50°34° AprMay: average high 60 °F, low 43 °F 60°43° MayJune: average high 69 °F, low 49 °F 69°49° JunJuly: average high 75 °F, low 55 °F 75°55° JulAugust: average high 75 °F, low 56 °F 75°56° AugSeptember: average high 67 °F, low 51 °F 67°51° SepOctober: average high 57 °F, low 42 °F 57°42° OctNovember: average high 46 °F, low 34 °F 46°34° NovDecember: average high 37 °F, low 23 °F 37°23° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 4.20 in precipitation, 15.3 in snowfall 4.2❄15 JanFebruary: 3.20 in precipitation, 13.7 in snowfall 3.2❄14 FebMarch: 4.08 in precipitation, 12.7 in snowfall 4.1❄13 MarApril: 4.45 in precipitation, 4.1 in snowfall 4.5❄4 AprMay: 3.27 in precipitation 3.3 MayJune: 3.87 in precipitation 3.9 JunJuly: 2.67 in precipitation 2.7 JulAugust: 3.24 in precipitation 3.2 AugSeptember: 4.32 in precipitation 4.3 SepOctober: 5.14 in precipitation, 0.1 in snowfall 5.1 OctNovember: 4.64 in precipitation, 1.6 in snowfall 4.6❄2 NovDecember: 4.57 in precipitation, 14.3 in snowfall 4.6❄14 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Eastport, ME (within 1 mile); precipitation: Eastport, ME (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

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

046676a
Perry, ME · 7 mi
046526a
Lubec, ME · 7 mi
046665b
Pembroke, ME · 11 mi
046715b
Robbinston, ME · 13 mi
046285b
Dennysville, ME · 13 mi
046915b
Whiting, ME · 16 mi
046195b
Calais, ME · 19 mi
046266a
Cutler, ME · 20 mi

Maine planting zones →

Questions about 04631

What planting zone is ZIP code 04631?

ZIP code 04631 (Eastport, ME) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Eastport, ME?

The median last spring frost (32 °F) near 04631 is April 29; after May 11 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Eastport station.

When is the first frost in Eastport, ME?

The median first fall frost near 04631 is October 25, giving a median frost-free growing season of 178 days.

When should I plant tomatoes in 04631?

Start tomato seeds indoors around Mar 4 – Mar 18 and set transplants outside around May 6 – May 20, one to three weeks after the median last frost.

How much rain and snow does 04631 get?

About 47.6 inches of precipitation a year and 62 inches of snowfall (NOAA 1991–2020 normals, Eastport station).

How hot do summers get in Eastport, 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 04631 have?

The USDA soil survey maps Scantic at the center of ZIP 04631: silt loam, poorly drained, pH about 6.0 (slightly acidic).

Did spring come early in Eastport, ME in 2026?

Spring leaf-out near 04631 came on Apr 26 in 2026, about the same as the 1991–2020 average (Apr 25), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Eastport, ME?

Long-day onions: the longest day near 04631 is 15 h 36 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).