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

Planting zone for 04616 — Brooklin, ME

ZIP code 04616 (Brooklin, Hancock County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 27 and the first fall frost October 22.

Where ZIP 04616 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 27
First frostOct 22
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 Brooklin, 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 Brooklin, ME

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 27median — 50% chance of a later frost
Safe for tender plantsMay 8only 10% chance of frost after
First fall frostOctober 22median — 10% chance by Oct 6
Growing season177 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 15 and returns around November 2.

From the NOAA station Acadia Np, ME — 15 miles away, elevation 469 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 04616

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 16 – Mar 30
SpinachSow outdoors · Mar 16 – Apr 6
Broccoli, cabbageStart indoors · Feb 16 – Mar 2
Broccoli, cabbageTransplant · Apr 6 – Apr 20
Onion setsPlant outdoors · Mar 30 – Apr 13
PotatoesPlant outdoors · Apr 6 – Apr 20
LettuceSow outdoors · Mar 30 – Apr 13
Carrots, beetsSow outdoors · Apr 6 – Apr 20
TomatoesStart indoors · Mar 2 – Mar 16
TomatoesTransplant · May 4 – May 18
Peppers, eggplantStart indoors · Feb 16 – Mar 2
Peppers, eggplantTransplant · May 11 – May 25
BeansSow outdoors · May 4 – May 18
Sweet cornSow outdoors · May 4 – May 18
Cucumbers, squashSow outdoors · May 4 – May 18
Fall lettuce, spinachSow outdoors · Aug 27 – Sep 10
GarlicPlant cloves · Oct 8 – Nov 12
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 27) and first fall frost (Oct 22) 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 04616 came on Apr 17 — 6 days earlier than the 1991–2020 average (Apr 23).

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 Brooklin, ME

The soil mapped at the center of ZIP 04616 is Lamoine — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables
pH5.7moderately acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter6%high
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Lamoine-Scantic complex, 0 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 04616; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Brooklin, ME

Summer high79 °Faverage high, July
Winter low15 °Faverage low, January
Hot days3days a year at 90 °F or more
Freezing nights141nights a year at 32 °F or less
Growing degree days2,291base 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)
Precipitation55.5 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 33 °F, low 15 °F 33°15° JanFebruary: average high 35 °F, low 18 °F 35°18° FebMarch: average high 42 °F, low 25 °F 42°25° MarApril: average high 53 °F, low 35 °F 53°35° AprMay: average high 65 °F, low 45 °F 65°45° MayJune: average high 74 °F, low 54 °F 74°54° JunJuly: average high 79 °F, low 60 °F 79°60° JulAugust: average high 78 °F, low 60 °F 78°60° AugSeptember: average high 71 °F, low 53 °F 71°53° SepOctober: average high 59 °F, low 43 °F 59°43° OctNovember: average high 48 °F, low 33 °F 48°33° NovDecember: average high 38 °F, low 22 °F 38°22° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 4.48 in precipitation 4.5 JanFebruary: 3.84 in precipitation 3.8 FebMarch: 4.94 in precipitation 4.9 MarApril: 5.15 in precipitation 5.2 AprMay: 4.50 in precipitation 4.5 MayJune: 4.28 in precipitation 4.3 JunJuly: 3.27 in precipitation 3.3 JulAugust: 3.45 in precipitation 3.5 AugSeptember: 4.22 in precipitation 4.2 SepOctober: 5.86 in precipitation 5.9 OctNovember: 5.89 in precipitation 5.9 NovDecember: 5.66 in precipitation 5.7 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Acadia Np, ME (15 mi away); precipitation: Acadia Np, ME (15 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

046746a
Seal Cove, ME · 4 mi
046736a
Sargentville, ME · 7 mi
046765b
Sedgwick, ME · 7 mi
046126a
Bernard, ME · 8 mi
046145b
Blue Hill, ME · 9 mi
046506a
Little Deer Isle, ME · 9 mi
046856b
Swans Island, ME · 9 mi
046295b
East Blue Hill, ME · 10 mi

Maine planting zones →

Questions about 04616

What planting zone is ZIP code 04616?

ZIP code 04616 (Brooklin, 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 Brooklin, ME?

The median last spring frost (32 °F) near 04616 is April 27; after May 8 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Acadia Np station.

When is the first frost in Brooklin, ME?

The median first fall frost near 04616 is October 22, giving a median frost-free growing season of 177 days.

When should I plant tomatoes in 04616?

Start tomato seeds indoors around Mar 2 – Mar 16 and set transplants outside around May 4 – May 18, one to three weeks after the median last frost.

How much rain and snow does 04616 get?

About 55.5 inches of precipitation a year (NOAA 1991–2020 normals, Acadia Np station).

How hot do summers get in Brooklin, 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 04616 have?

The USDA soil survey maps Lamoine at the center of ZIP 04616: silt loam, somewhat poorly drained, pH about 5.7 (moderately acidic).

Did spring come early in Brooklin, ME in 2026?

Spring leaf-out near 04616 came on Apr 17 in 2026, 6 days earlier than the 1991–2020 average (Apr 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Brooklin, ME?

Long-day onions: the longest day near 04616 is 15 h 31 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 04616 change?

Yes. The 2012 USDA map put 04616 in zone 5b; the 2023 map puts it in zone 6a. The newer map uses 1991–2020 data and more weather stations.