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

Planting zone for 02190 — South Weymouth, MA

ZIP code 02190 (South 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 02190 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 South 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 South 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 — 4 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 02190

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 02190 came on Apr 3 — 3 days earlier than the 1991–2020 average (Apr 6).

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).

Native plants for zone 6b in Massachusetts

548 plants native to the lower 48 states, recorded in Massachusetts, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. Each links to its USDA PLANTS profile.

Trees 66

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 109

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °F

Wildflowers & perennials 188

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °F

Grasses 159

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °FAmerican cupscale3 ft · blooms early summer · high shade tolerance · to −18 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °FAtlantic mannagrass3 ft · blooms summer · low shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °F

Vines 8

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °Ftrumpet creeper2 ft · blooms summer · high shade tolerance · to −13 °F

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in South Weymouth, MA.

Soil in South Weymouth, MA

The center of ZIP 02190 is mapped as Urban land, 0 to 15 percent slopes: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

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 02190; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in South 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 06 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

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 38 °F, low 22 °F 38°22° JanFebruary: average high 40 °F, low 23 °F 40°23° FebMarch: average high 47 °F, low 29 °F 47°29° MarApril: average high 58 °F, low 38 °F 58°38° AprMay: average high 69 °F, low 48 °F 69°48° MayJune: average high 77 °F, low 57 °F 77°57° JunJuly: average high 83 °F, low 63 °F 83°63° JulAugust: average high 82 °F, low 62 °F 82°62° AugSeptember: average high 74 °F, low 55 °F 74°55° SepOctober: average high 63 °F, low 44 °F 63°44° OctNovember: average high 52 °F, low 35 °F 52°35° NovDecember: average high 43 °F, low 27 °F 43°27° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 4.49 in precipitation, 14.8 in snowfall 4.5❄15 JanFebruary: 3.97 in precipitation, 14.5 in snowfall 4.0❄15 FebMarch: 5.39 in precipitation, 10.3 in snowfall 5.4❄10 MarApril: 4.64 in precipitation, 1.7 in snowfall 4.6❄2 AprMay: 3.78 in precipitation 3.8 MayJune: 4.04 in precipitation 4.0 JunJuly: 3.56 in precipitation 3.6 JulAugust: 3.83 in precipitation 3.8 AugSeptember: 3.90 in precipitation 3.9 SepOctober: 5.22 in precipitation, 0.1 in snowfall 5.2 OctNovember: 4.43 in precipitation, 0.7 in snowfall 4.4❄1 NovDecember: 5.07 in precipitation, 8.8 in snowfall 5.1❄9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hingham, MA (4 mi away); precipitation: Hingham, MA (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

021886b
Weymouth, MA · 3 mi
023436b
Holbrook, MA · 3 mi
021897a
East Weymouth, MA · 3 mi
023706b
Rockland, MA · 3 mi
023516b
Abington, MA · 4 mi
020186b
Accord, MA · 4 mi
021846b
Braintree, MA · 4 mi
020437a
Hingham, MA · 5 mi

Massachusetts planting zones →

Questions about 02190

What planting zone is ZIP code 02190?

ZIP code 02190 (South 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 South Weymouth, MA?

The median last spring frost (32 °F) near 02190 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 South Weymouth, MA?

The median first fall frost near 02190 is October 22, giving a median frost-free growing season of 177 days.

When should I plant tomatoes in 02190?

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 02190 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 South Weymouth, MA?

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

Did spring come early in South Weymouth, MA in 2026?

Spring leaf-out near 02190 came on Apr 3 in 2026, 3 days earlier than the 1991–2020 average (Apr 6), according to the USA National Phenology Network Spring Index.

What kind of onions grow in South Weymouth, MA?

Long-day onions: the longest day near 02190 is 15 h 16 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).