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

Planting zone for 04945 — Jackman, ME

ZIP code 04945 (Jackman, Somerset County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 26 and the first fall frost September 23.

Where ZIP 04945 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.

Zone4b−25 to −20 °F
Coldest night−31.7 to −28.9 °C
Last frostMay 26
First frostSep 23
2012 zone4a

Was 4a 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 4b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Jackman, 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 Jackman, ME

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 26median — 50% chance of a later frost
Safe for tender plantsJune 7only 10% chance of frost after
First fall frostSeptember 23median — 10% chance by Sep 8
Growing season119 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 11 and returns around October 3.

From the NOAA station Jackman, ME — 4 miles away, elevation 1,214 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 04945

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 14 – Apr 28
SpinachSow outdoors · Apr 14 – May 5
Broccoli, cabbageStart indoors · Mar 17 – Mar 31
Broccoli, cabbageTransplant · May 5 – May 19
Onion setsPlant outdoors · Apr 28 – May 12
PotatoesPlant outdoors · May 5 – May 19
LettuceSow outdoors · Apr 28 – May 12
Carrots, beetsSow outdoors · May 5 – May 19
TomatoesStart indoors · Mar 31 – Apr 14
TomatoesTransplant · Jun 2 – Jun 16
Peppers, eggplantStart indoors · Mar 17 – Mar 31
Peppers, eggplantTransplant · Jun 9 – Jun 23
BeansSow outdoors · Jun 2 – Jun 16
Sweet cornSow outdoors · Jun 2 – Jun 16
Cucumbers, squashSow outdoors · Jun 2 – Jun 16
Fall lettuce, spinachSow outdoors · Jul 29 – Aug 12
GarlicPlant cloves · Sep 9 – Oct 14
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 26) and first fall frost (Sep 23) 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 04945 came on Apr 27 — 7 days earlier than the 1991–2020 average (May 4).

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 4b in Maine

451 plants native to the lower 48 states, recorded in Maine, and rated by the USDA to survive −25 °F or colder — the bottom of zone 4b. Each links to its USDA PLANTS profile.

Trees 52

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 86

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 153

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 144

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 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °F

Vines 5

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 °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 Jackman, ME.

Soil in Jackman, ME

The soil mapped at the center of ZIP 04945 is Telos — moderately decomposed plant material, somewhat poorly drained.

TextureModerately decomposed plant materialtop layer
DrainageSomewhat poorly drainedconsider raised beds
Organic matter53%high
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Telos-Chesuncook-Elliottsville 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 04945; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Jackman, ME

Summer high77 °Faverage high, July
Winter low0 °Faverage low, January
Hot days1days a year at 90 °F or more
Freezing nights197nights a year at 32 °F or less
Growing degree days1,507base 50 °F — the season’s usable heat
Longest day15 h 42 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)
Precipitation41.8 inper year, rain and melted snow
Snowfall107 inper year; 139 days with snow on the ground

Average high and low, by month

−10°0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 22 °F, low 0 °F 22°0° JanFebruary: average high 26 °F, low 0 °F 26°0° FebMarch: average high 35 °F, low 11 °F 35°11° MarApril: average high 48 °F, low 25 °F 48°25° AprMay: average high 63 °F, low 37 °F 63°37° MayJune: average high 72 °F, low 48 °F 72°48° JunJuly: average high 77 °F, low 53 °F 77°53° JulAugust: average high 76 °F, low 51 °F 76°51° AugSeptember: average high 69 °F, low 43 °F 69°43° SepOctober: average high 54 °F, low 32 °F 54°32° OctNovember: average high 41 °F, low 22 °F 41°22° NovDecember: average high 29 °F, low 10 °F 29°10° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 2.54 in precipitation, 21.5 in snowfall 2.5❄22 JanFebruary: 2.31 in precipitation, 25.2 in snowfall 2.3❄25 FebMarch: 2.56 in precipitation, 19.4 in snowfall 2.6❄19 MarApril: 3.25 in precipitation, 7.6 in snowfall 3.3❄8 AprMay: 3.67 in precipitation, 0.2 in snowfall 3.7 MayJune: 4.64 in precipitation 4.6 JunJuly: 4.57 in precipitation 4.6 JulAugust: 4.00 in precipitation 4.0 AugSeptember: 3.46 in precipitation 3.5 SepOctober: 4.28 in precipitation, 1.6 in snowfall 4.3❄2 OctNovember: 3.07 in precipitation, 7.2 in snowfall 3.1❄7 NovDecember: 3.42 in precipitation, 24.2 in snowfall 3.4❄24 Dec

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

Nearby ZIP codes

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

049854b
West Forks, ME · 23 mi
049364b
Eustis, ME · 24 mi
044784b
Rockwood, ME · 27 mi
049614b
New Portland, ME · 30 mi
049255a
Caratunk, ME · 31 mi
049824b
Stratton, ME · 33 mi
049475a
Kingfield, ME · 37 mi
049205a
Bingham, ME · 40 mi

Maine planting zones →

Questions about 04945

What planting zone is ZIP code 04945?

ZIP code 04945 (Jackman, ME) is in USDA hardiness zone 4b on the 2023 map: the coldest night of an average winter reaches −25 to −20 °F (−31.7 to −28.9 °C).

When is the last frost in Jackman, ME?

The median last spring frost (32 °F) near 04945 is May 26; after June 7 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Jackman station.

When is the first frost in Jackman, ME?

The median first fall frost near 04945 is September 23, giving a median frost-free growing season of 119 days.

When should I plant tomatoes in 04945?

Start tomato seeds indoors around Mar 31 – Apr 14 and set transplants outside around Jun 2 – Jun 16, one to three weeks after the median last frost.

How much rain and snow does 04945 get?

About 41.8 inches of precipitation a year and 107 inches of snowfall (NOAA 1991–2020 normals, Jackman station).

How hot do summers get in Jackman, ME?

The average high peaks at 77 °F in July, with about 1 days a year at 90 °F or more.

What kind of soil does 04945 have?

The USDA soil survey maps Telos at the center of ZIP 04945: moderately decomposed plant material, somewhat poorly drained.

Did spring come early in Jackman, ME in 2026?

Spring leaf-out near 04945 came on Apr 27 in 2026, 7 days earlier than the 1991–2020 average (May 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Jackman, ME?

Long-day onions: the longest day near 04945 is 15 h 42 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 04945 change?

Yes. The 2012 USDA map put 04945 in zone 4a; the 2023 map puts it in zone 4b. The newer map uses 1991–2020 data and more weather stations.