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

Planting zone for 04265 — North Monmouth, ME

ZIP code 04265 (North Monmouth, Kennebec County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 1 and the first fall frost October 10.

Where ZIP 04265 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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostMay 1
First frostOct 10
2012 zone5a

Was 5a 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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for North Monmouth, 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 North Monmouth, ME

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 1median — 50% chance of a later frost
Safe for tender plantsMay 13only 10% chance of frost after
First fall frostOctober 10median — 10% chance by Sep 29
Growing season162 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 19 and returns around October 25.

From the NOAA station Turner, ME — 11 miles away, elevation 564 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 04265

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 20 – Apr 3
SpinachSow outdoors · Mar 20 – Apr 10
Broccoli, cabbageStart indoors · Feb 20 – Mar 6
Broccoli, cabbageTransplant · Apr 10 – Apr 24
Onion setsPlant outdoors · Apr 3 – Apr 17
PotatoesPlant outdoors · Apr 10 – Apr 24
LettuceSow outdoors · Apr 3 – Apr 17
Carrots, beetsSow outdoors · Apr 10 – Apr 24
TomatoesStart indoors · Mar 6 – Mar 20
TomatoesTransplant · May 8 – May 22
Peppers, eggplantStart indoors · Feb 20 – Mar 6
Peppers, eggplantTransplant · May 15 – May 29
BeansSow outdoors · May 8 – May 22
Sweet cornSow outdoors · May 8 – May 22
Cucumbers, squashSow outdoors · May 8 – May 22
Fall lettuce, spinachSow outdoors · Aug 15 – Aug 29
GarlicPlant cloves · Sep 26 – Oct 31
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 1) and first fall frost (Oct 10) 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 04265 came on Apr 16 — 6 days earlier than the 1991–2020 average (Apr 22).

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).

Soil in North Monmouth, ME

The soil mapped at the center of ZIP 04265 is Woodbridge — fine sandy loam, moderately well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding
pH4.8strongly acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter4%moderate
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classprime farmlandUSDA classification

Map unit: Woodbridge fine sandy loam, 3 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 04265; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in North Monmouth, ME

Summer high79 °Faverage high, July
Winter low10 °Faverage low, January
Hot days3days a year at 90 °F or more
Freezing nights155nights a year at 32 °F or less
Growing degree days2,112base 50 °F — the season’s usable heat
Longest day15 h 31 mindaylight on June 21
Shortest day8 h 51 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation48.1 inper year, rain and melted snow
Snowfall78 inper year; 107 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 28 °F, low 10 °F 28°10° JanFebruary: average high 31 °F, low 12 °F 31°12° FebMarch: average high 39 °F, low 21 °F 39°21° MarApril: average high 52 °F, low 33 °F 52°33° AprMay: average high 65 °F, low 43 °F 65°43° MayJune: average high 74 °F, low 53 °F 74°53° JunJuly: average high 79 °F, low 59 °F 79°59° JulAugust: average high 78 °F, low 57 °F 78°57° AugSeptember: average high 71 °F, low 49 °F 71°49° SepOctober: average high 57 °F, low 39 °F 57°39° OctNovember: average high 45 °F, low 28 °F 45°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: 3.65 in precipitation, 17.3 in snowfall 3.6❄17 JanFebruary: 2.99 in precipitation, 20.7 in snowfall 3.0❄21 FebMarch: 3.77 in precipitation, 13.3 in snowfall 3.8❄13 MarApril: 4.24 in precipitation, 4.9 in snowfall 4.2❄5 AprMay: 3.79 in precipitation, 0.3 in snowfall 3.8 MayJune: 4.42 in precipitation 4.4 JunJuly: 3.94 in precipitation 3.9 JulAugust: 3.52 in precipitation 3.5 AugSeptember: 3.93 in precipitation 3.9 SepOctober: 5.09 in precipitation, 0.2 in snowfall 5.1 OctNovember: 4.39 in precipitation, 3.8 in snowfall 4.4❄4 NovDecember: 4.37 in precipitation, 17.2 in snowfall 4.4❄17 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Turner, ME (11 mi away); precipitation: Turner, ME (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 5b.

042595b
Monmouth, ME · 3 mi
042845b
Wayne, ME · 4 mi
043645b
Winthrop, ME · 4 mi
042635b
Leeds, ME · 5 mi
043435b
East Winthrop, ME · 8 mi
042365b
Greene, ME · 8 mi
043555b
Readfield, ME · 8 mi
043505b
Litchfield, ME · 9 mi

Maine planting zones →

Questions about 04265

What planting zone is ZIP code 04265?

ZIP code 04265 (North Monmouth, 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 North Monmouth, ME?

The median last spring frost (32 °F) near 04265 is May 1; after May 13 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Turner station.

When is the first frost in North Monmouth, ME?

The median first fall frost near 04265 is October 10, giving a median frost-free growing season of 162 days.

When should I plant tomatoes in 04265?

Start tomato seeds indoors around Mar 6 – Mar 20 and set transplants outside around May 8 – May 22, one to three weeks after the median last frost.

How much rain and snow does 04265 get?

About 48.1 inches of precipitation a year and 78 inches of snowfall (NOAA 1991–2020 normals, Turner station).

How hot do summers get in North Monmouth, ME?

The average high peaks at 79 °F in July, with about 3 days a year at 90 °F or more.

What kind of soil does 04265 have?

The USDA soil survey maps Woodbridge at the center of ZIP 04265: fine sandy loam, moderately well drained, pH about 4.8 (strongly acidic).

Did spring come early in North Monmouth, ME in 2026?

Spring leaf-out near 04265 came on Apr 16 in 2026, 6 days earlier than the 1991–2020 average (Apr 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in North Monmouth, ME?

Long-day onions: the longest day near 04265 is 15 h 31 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 04265 change?

Yes. The 2012 USDA map put 04265 in zone 5a; the 2023 map puts it in zone 5b. The newer map uses 1991–2020 data and more weather stations.