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

Planting zone for 04992 — West Farmington, ME

ZIP code 04992 (West Farmington, Franklin County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 16 and the first fall frost September 26.

Where ZIP 04992 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.

Zone5a−20 to −15 °F
Coldest night−28.9 to −26.1 °C
Last frostMay 16
First frostSep 26
2012 zone4b

Was 4b 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 5a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for West Farmington, 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 West Farmington, ME

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 16median — 50% chance of a later frost
Safe for tender plantsJune 1only 10% chance of frost after
First fall frostSeptember 26median — 10% chance by Sep 14
Growing season130 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 3 and returns around October 5.

From the NOAA station Farmington, ME — 2 miles away, elevation 404 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 04992

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 4 – Apr 18
SpinachSow outdoors · Apr 4 – Apr 25
Broccoli, cabbageStart indoors · Mar 7 – Mar 21
Broccoli, cabbageTransplant · Apr 25 – May 9
Onion setsPlant outdoors · Apr 18 – May 2
PotatoesPlant outdoors · Apr 25 – May 9
LettuceSow outdoors · Apr 18 – May 2
Carrots, beetsSow outdoors · Apr 25 – May 9
TomatoesStart indoors · Mar 21 – Apr 4
TomatoesTransplant · May 23 – Jun 6
Peppers, eggplantStart indoors · Mar 7 – Mar 21
Peppers, eggplantTransplant · May 30 – Jun 13
BeansSow outdoors · May 23 – Jun 6
Sweet cornSow outdoors · May 23 – Jun 6
Cucumbers, squashSow outdoors · May 23 – Jun 6
Fall lettuce, spinachSow outdoors · Aug 1 – Aug 15
GarlicPlant cloves · Sep 12 – Oct 17
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 16) and first fall frost (Sep 26) 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 04992 came on Apr 17 — 9 days earlier than the 1991–2020 average (Apr 26).

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 West Farmington, ME

The soil mapped at the center of ZIP 04992 is Boothbay — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables
pH5.9moderately acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter4.5%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Boothbay silt 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 04992; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in West Farmington, ME

Summer high79 °Faverage high, July
Winter low6 °Faverage low, January
Hot days3days a year at 90 °F or more
Freezing nights183nights a year at 32 °F or less
Growing degree days1,832base 50 °F — the season’s usable heat
Longest day15 h 34 mindaylight on June 21
Shortest day8 h 48 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation49.5 inper year, rain and melted snow
Snowfall94 inper year; 112 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 6 °F 27°6° JanFebruary: average high 30 °F, low 7 °F 30°7° FebMarch: average high 39 °F, low 18 °F 39°18° MarApril: average high 52 °F, low 30 °F 52°30° AprMay: average high 65 °F, low 41 °F 65°41° MayJune: average high 74 °F, low 50 °F 74°50° JunJuly: average high 79 °F, low 56 °F 79°56° JulAugust: average high 77 °F, low 54 °F 77°54° AugSeptember: average high 70 °F, low 45 °F 70°45° SepOctober: average high 57 °F, low 35 °F 57°35° OctNovember: average high 44 °F, low 26 °F 44°26° NovDecember: average high 33 °F, low 15 °F 33°15° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.53 in precipitation, 20.7 in snowfall 3.5❄21 JanFebruary: 3.15 in precipitation, 22.9 in snowfall 3.1❄23 FebMarch: 3.99 in precipitation, 18.8 in snowfall 4.0❄19 MarApril: 4.34 in precipitation, 5.3 in snowfall 4.3❄5 AprMay: 3.87 in precipitation, 0.2 in snowfall 3.9 MayJune: 5.09 in precipitation 5.1 JunJuly: 3.96 in precipitation 4.0 JulAugust: 4.05 in precipitation 4.0 AugSeptember: 3.51 in precipitation 3.5 SepOctober: 5.21 in precipitation, 0.3 in snowfall 5.2 OctNovember: 4.44 in precipitation, 4.9 in snowfall 4.4❄5 NovDecember: 4.31 in precipitation, 20.8 in snowfall 4.3❄21 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Farmington, ME (2 mi away); precipitation: Farmington, ME (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

049385a
Farmington, ME · 3 mi
042345a
East Wilton, ME · 4 mi
049405a
Farmington Falls, ME · 5 mi
042254b
Dryden, ME · 5 mi
049845a
Temple, ME · 6 mi
042945a
Wilton, ME · 6 mi
049555a
New Sharon, ME · 8 mi
042625a
North Jay, ME · 9 mi

Maine planting zones →

Questions about 04992

What planting zone is ZIP code 04992?

ZIP code 04992 (West Farmington, ME) is in USDA hardiness zone 5a on the 2023 map: the coldest night of an average winter reaches −20 to −15 °F (−28.9 to −26.1 °C).

When is the last frost in West Farmington, ME?

The median last spring frost (32 °F) near 04992 is May 16; after June 1 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Farmington station.

When is the first frost in West Farmington, ME?

The median first fall frost near 04992 is September 26, giving a median frost-free growing season of 130 days.

When should I plant tomatoes in 04992?

Start tomato seeds indoors around Mar 21 – Apr 4 and set transplants outside around May 23 – Jun 6, one to three weeks after the median last frost.

How much rain and snow does 04992 get?

About 49.5 inches of precipitation a year and 94 inches of snowfall (NOAA 1991–2020 normals, Farmington station).

How hot do summers get in West Farmington, 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 04992 have?

The USDA soil survey maps Boothbay at the center of ZIP 04992: silt loam, somewhat poorly drained, pH about 5.9 (moderately acidic).

Did spring come early in West Farmington, ME in 2026?

Spring leaf-out near 04992 came on Apr 17 in 2026, 9 days earlier than the 1991–2020 average (Apr 26), according to the USA National Phenology Network Spring Index.

What kind of onions grow in West Farmington, ME?

Long-day onions: the longest day near 04992 is 15 h 34 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 04992 change?

Yes. The 2012 USDA map put 04992 in zone 4b; the 2023 map puts it in zone 5a. The newer map uses 1991–2020 data and more weather stations.