Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 04548 — Georgetown, ME

ZIP code 04548 (Georgetown, Sagadahoc County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 28 and the first fall frost October 21.

Where ZIP 04548 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 28

First frostOct 21

2012 zone5b

Was 5b 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 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Georgetown, 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 Georgetown, ME

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostApril 28median — 50% chance of a later frost

Safe for tender plantsMay 9only 10% chance of frost after

First fall frostOctober 21median — 10% chance by Oct 5

Growing season175 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 13 and returns around November 4.

From the NOAA station Westport Island, ME — 4 miles away, elevation 89 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 04548

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 17 – Mar 31

SpinachSow outdoors · Mar 17 – Apr 7

Broccoli, cabbageStart indoors · Feb 17 – Mar 3

Broccoli, cabbageTransplant · Apr 7 – Apr 21

Onion setsPlant outdoors · Mar 31 – Apr 14

PotatoesPlant outdoors · Apr 7 – Apr 21

LettuceSow outdoors · Mar 31 – Apr 14

Carrots, beetsSow outdoors · Apr 7 – Apr 21

TomatoesStart indoors · Mar 3 – Mar 17

TomatoesTransplant · May 5 – May 19

Peppers, eggplantStart indoors · Feb 17 – Mar 3

Peppers, eggplantTransplant · May 12 – May 26

BeansSow outdoors · May 5 – May 19

Sweet cornSow outdoors · May 5 – May 19

Cucumbers, squashSow outdoors · May 5 – May 19

Fall lettuce, spinachSow outdoors · Aug 26 – Sep 9

GarlicPlant cloves · Oct 7 – Nov 11

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 28) and first fall frost (Oct 21) 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 04548 came on Apr 17 — 3 days earlier than the 1991–2020 average (Apr 20).

average
Apr 202026
Apr 17

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 Georgetown, ME

The soil mapped at the center of ZIP 04548 is Lyman — moderately decomposed plant material, somewhat excessively drained.

TextureModerately decomposed plant materialtop layer

pH3.5strongly acidic; most vegetables like 6.0–7.0

DrainageSomewhat excessively drainednatural drainage class

Organic matter85%high

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Lyman-Abram complex, 8 to 15 percent slopes, very rocky.

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 04548; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Georgetown, ME

Summer high76 °Faverage high, July

Winter low14 °Faverage low, January

Hot days1days a year at 90 °F or more

Freezing nights148nights a year at 32 °F or less

Growing degree days1,990base 50 °F — the season’s usable heat

Longest day15 h 28 mindaylight on June 21

Shortest day8 h 54 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation50 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Westport Island, ME (4 mi away); precipitation: Westport Island 2.2 Ssw, ME (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

045766a

Southport, ME · 5 mi

045756a

West Boothbay Harbor, ME · 5 mi

045306a

Bath, ME · 5 mi

045626a

Phippsburg, ME · 6 mi

045716a

Trevett, ME · 6 mi

045386a

Boothbay Harbor, ME · 6 mi

045706a

Squirrel Island, ME · 6 mi

045656a

Sebasco Estates, ME · 7 mi

Maine planting zones →

Questions about 04548

What planting zone is ZIP code 04548?

ZIP code 04548 (Georgetown, 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 Georgetown, ME?

The median last spring frost (32 °F) near 04548 is April 28; after May 9 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Westport Island station.

When is the first frost in Georgetown, ME?

The median first fall frost near 04548 is October 21, giving a median frost-free growing season of 175 days.

When should I plant tomatoes in 04548?

Start tomato seeds indoors around Mar 3 – Mar 17 and set transplants outside around May 5 – May 19, one to three weeks after the median last frost.

How much rain and snow does 04548 get?

About 50 inches of precipitation a year (NOAA 1991–2020 normals, Westport Island 2.2 Ssw station).

How hot do summers get in Georgetown, ME?

The average high peaks at 76 °F in July, with about 1 days a year at 90 °F or more.

What kind of soil does 04548 have?

The USDA soil survey maps Lyman at the center of ZIP 04548: moderately decomposed plant material, somewhat excessively drained, pH about 3.5 (strongly acidic).

Did spring come early in Georgetown, ME in 2026?

Spring leaf-out near 04548 came on Apr 17 in 2026, 3 days earlier than the 1991–2020 average (Apr 20), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Georgetown, ME?

Long-day onions: the longest day near 04548 is 15 h 28 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 04548 change?

Yes. The 2012 USDA map put 04548 in zone 5b; the 2023 map puts it in zone 6a. The newer map uses 1991–2020 data and more weather stations.