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

Planting zone for 02188 — Weymouth, MA

ZIP code 02188 (Weymouth, Norfolk County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 25 and the first fall frost October 22.

Where ZIP 02188 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.

Zone6b−5 to 0 °F

Coldest night−20.6 to −17.8 °C

Last frostApr 25

First frostOct 22

2012 zone6b

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Weymouth, MA…

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 Weymouth, MA

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 25median — 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 10 and returns around November 2.

From the NOAA station Hingham, MA — 2 miles away, elevation 36 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 02188

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 14 – Mar 28

SpinachSow outdoors · Mar 14 – Apr 4

Broccoli, cabbageStart indoors · Feb 14 – Feb 28

Broccoli, cabbageTransplant · Apr 4 – Apr 18

Onion setsPlant outdoors · Mar 28 – Apr 11

PotatoesPlant outdoors · Apr 4 – Apr 18

LettuceSow outdoors · Mar 28 – Apr 11

Carrots, beetsSow outdoors · Apr 4 – Apr 18

TomatoesStart indoors · Feb 28 – Mar 14

TomatoesTransplant · May 2 – May 16

Peppers, eggplantStart indoors · Feb 14 – Feb 28

Peppers, eggplantTransplant · May 9 – May 23

BeansSow outdoors · May 2 – May 16

Sweet cornSow outdoors · May 2 – May 16

Cucumbers, squashSow outdoors · May 2 – May 16

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 25) 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 02188 came on Apr 3 — about the same time as the 1991–2020 average (Apr 4).

average
Apr 42026
Apr 3

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 Weymouth, MA

The soil mapped at the center of ZIP 02188 is Hinckley — moderately decomposed plant material, excessively drained.

TextureModerately decomposed plant materialtop layer

DrainageExcessively drainednatural drainage class

Organic matter95%high

Hydrologic groupAwater soaks in fast

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Hinckley loamy sand, 8 to 15 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 02188; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Weymouth, MA

Summer high83 °Faverage high, July

Winter low22 °Faverage low, January

Hot days13days a year at 90 °F or more

Freezing nights115nights a year at 32 °F or less

Growing degree days2,921base 50 °F — the season’s usable heat

Longest day15 h 16 mindaylight on June 21

Shortest day9 h 05 mindaylight on December 21

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

Precipitation52.3 inper year, rain and melted snow

Snowfall51 inper year; 46 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

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

Nearby ZIP codes

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

021897a

East Weymouth, MA · 2 mi

021846b

Braintree, MA · 2 mi

021906b

South Weymouth, MA · 3 mi

021917a

North Weymouth, MA · 3 mi

Massachusetts planting zones →

Questions about 02188

What planting zone is ZIP code 02188?

ZIP code 02188 (Weymouth, MA) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Weymouth, MA?

The median last spring frost (32 °F) near 02188 is April 25; after May 8 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Hingham station.

When is the first frost in Weymouth, MA?

The median first fall frost near 02188 is October 22, giving a median frost-free growing season of 177 days.

When should I plant tomatoes in 02188?

Start tomato seeds indoors around Feb 28 – Mar 14 and set transplants outside around May 2 – May 16, one to three weeks after the median last frost.

How much rain and snow does 02188 get?

About 52.3 inches of precipitation a year and 51 inches of snowfall (NOAA 1991–2020 normals, Hingham station).

How hot do summers get in Weymouth, MA?

The average high peaks at 83 °F in July, with about 13 days a year at 90 °F or more.

What kind of soil does 02188 have?

The USDA soil survey maps Hinckley at the center of ZIP 02188: moderately decomposed plant material, excessively drained.

Did spring come early in Weymouth, MA in 2026?

Spring leaf-out near 02188 came on Apr 3 in 2026, about the same as the 1991–2020 average (Apr 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Weymouth, MA?

Long-day onions: the longest day near 02188 is 15 h 16 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).