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

Planting zone for Plymouth, MA

Plymouth, MA is in USDA zone 7a across its 3 ZIP codes. The median last spring frost is April 15 and the first fall frost November 1.

Plymouth on the zone map

Outlined: its 1 ZIP code areas · 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.

Zone7a0 to 5 °F
ZIP codes3
Last frostApr 15
First frostNov 1
Growing season198 days

7a 3 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

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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 Plymouth, MA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 15median — 50% chance of a later frost
Safe for tender plantsApril 28only 10% chance of frost after
First fall frostNovember 1median — 10% chance by Oct 17
Growing season198 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 3 and returns around November 13.

From the NOAA station Plymouth-Kingston, MA, elevation 46 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 Plymouth

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 4 – Mar 18
SpinachSow outdoors · Mar 4 – Mar 25
Broccoli, cabbageStart indoors · Feb 4 – Feb 18
Broccoli, cabbageTransplant · Mar 25 – Apr 8
Onion setsPlant outdoors · Mar 18 – Apr 1
PotatoesPlant outdoors · Mar 25 – Apr 8
LettuceSow outdoors · Mar 18 – Apr 1
Carrots, beetsSow outdoors · Mar 25 – Apr 8
TomatoesStart indoors · Feb 18 – Mar 4
TomatoesTransplant · Apr 22 – May 6
Peppers, eggplantStart indoors · Feb 4 – Feb 18
Peppers, eggplantTransplant · Apr 29 – May 13
BeansSow outdoors · Apr 22 – May 6
Sweet cornSow outdoors · Apr 22 – May 6
Cucumbers, squashSow outdoors · Apr 22 – May 6
Fall lettuce, spinachSow outdoors · Sep 6 – Sep 20
GarlicPlant cloves · Oct 18 – Nov 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 15) and first fall frost (Nov 1) 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 02362 came on Apr 3 — about the same time as the 1991–2020 average (Apr 5).

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 7a in Massachusetts

561 plants native to the lower 48 states, recorded in Massachusetts, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. Each links to its USDA PLANTS profile.

Trees 67

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 110

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 192

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 165

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 9

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °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 °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 Plymouth, MA.

Soil in Plymouth, MA

The center of ZIP 02362 is mapped as Urban land, 0 to 8 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 02362; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Plymouth, MA

Summer high84 °Faverage high, July
Winter low22 °Faverage low, January
Hot days12days a year at 90 °F or more
Freezing nights120nights a year at 32 °F or less
Growing degree days3,094base 50 °F — the season’s usable heat
Longest day15 h 14 mindaylight on June 21
Shortest day9 h 07 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation52.8 inper year, rain and melted snow
Snowfall38 inper year; 27 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 41 °F, low 22 °F 41°22° JanFebruary: average high 43 °F, low 23 °F 43°23° FebMarch: average high 49 °F, low 29 °F 49°29° MarApril: average high 59 °F, low 38 °F 59°38° AprMay: average high 69 °F, low 48 °F 69°48° MayJune: average high 79 °F, low 58 °F 79°58° JunJuly: average high 84 °F, low 64 °F 84°64° JulAugust: average high 82 °F, low 63 °F 82°63° AugSeptember: average high 76 °F, low 57 °F 76°57° SepOctober: average high 65 °F, low 46 °F 65°46° OctNovember: average high 55 °F, low 36 °F 55°36° NovDecember: average high 46 °F, low 28 °F 46°28° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 4.79 in precipitation, 10.1 in snowfall 4.8❄10 JanFebruary: 4.24 in precipitation, 11.5 in snowfall 4.2❄12 FebMarch: 5.80 in precipitation, 8.5 in snowfall 5.8❄9 MarApril: 4.69 in precipitation, 1 in snowfall 4.7❄1 AprMay: 3.71 in precipitation 3.7 MayJune: 3.80 in precipitation 3.8 JunJuly: 3.49 in precipitation 3.5 JulAugust: 3.63 in precipitation 3.6 AugSeptember: 4.27 in precipitation 4.3 SepOctober: 5.01 in precipitation 5.0 OctNovember: 4.41 in precipitation, 0.1 in snowfall 4.4 NovDecember: 4.93 in precipitation, 6.7 in snowfall 4.9❄7 Dec

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

ZIP codes in Plymouth

023607a
0 to 5 °F
023617a
0 to 5 °F
023627a
0 to 5 °F

Massachusetts planting zones →

Questions about Plymouth

What planting zone is Plymouth, MA?

Plymouth, MA is in USDA hardiness zone 7a on the 2023 map (7a: 0 to 5 °F).

When is the last frost in Plymouth, MA?

The median last spring frost is April 15 and the median first fall frost is November 1 (NOAA 1991–2020 normals, Plymouth-Kingston station).

When can I plant a garden in Plymouth, MA?

Cool-season crops like peas and spinach go in around Mar 4 – Mar 25; tomatoes, peppers, beans and squash after about Apr 22, once frost risk has passed.

What kind of onions grow in Plymouth, MA?

Long-day onions: the longest day is 15 h 14 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

How much rain and snow does Plymouth, MA get?

About 52.8 inches of precipitation a year and 38 inches of snowfall (NOAA 1991–2020 normals).