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

Planting zone for 02346 — Middleboro, MA

ZIP code 02346 (Middleboro, Plymouth County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 23 and the first fall frost October 16.

Where ZIP 02346 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 23
First frostOct 16
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 Middleboro, 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 Middleboro, MA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 23median — 50% chance of a later frost
Safe for tender plantsMay 6only 10% chance of frost after
First fall frostOctober 16median — 10% chance by Oct 3
Growing season174 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 9 and returns around October 27.

From the NOAA station Middleboro, MA — 2 miles away, 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 02346

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 12 – Mar 26
SpinachSow outdoors · Mar 12 – Apr 2
Broccoli, cabbageStart indoors · Feb 12 – Feb 26
Broccoli, cabbageTransplant · Apr 2 – Apr 16
Onion setsPlant outdoors · Mar 26 – Apr 9
PotatoesPlant outdoors · Apr 2 – Apr 16
LettuceSow outdoors · Mar 26 – Apr 9
Carrots, beetsSow outdoors · Apr 2 – Apr 16
TomatoesStart indoors · Feb 26 – Mar 12
TomatoesTransplant · Apr 30 – May 14
Peppers, eggplantStart indoors · Feb 12 – Feb 26
Peppers, eggplantTransplant · May 7 – May 21
BeansSow outdoors · Apr 30 – May 14
Sweet cornSow outdoors · Apr 30 – May 14
Cucumbers, squashSow outdoors · Apr 30 – May 14
Fall lettuce, spinachSow outdoors · Aug 21 – Sep 4
GarlicPlant cloves · Oct 2 – Nov 6
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 23) and first fall frost (Oct 16) 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 02346 came on Apr 2 — 3 days earlier than 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 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 Middleboro, MA.

Soil in Middleboro, MA

The soil mapped at the center of ZIP 02346 is Tihonet — moderately decomposed plant material, poorly drained.

TextureModerately decomposed plant materialtop layer
DrainagePoorly drainedconsider raised beds
Organic matter70%high
Hydrologic groupA/Ddrains fast once dried out; wet otherwise
Farmland classFarmland of unique importanceUSDA classification

Map unit: Tihonet coarse sand, 0 to 3 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 02346; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Middleboro, MA

Summer high82 °Faverage high, July
Winter low17 °Faverage low, January
Hot days8days a year at 90 °F or more
Freezing nights139nights a year at 32 °F or less
Growing degree days2,589base 50 °F — the season’s usable heat
Longest day15 h 14 mindaylight on June 21
Shortest day9 h 08 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation52.4 inper year, rain and melted snow
Snowfall42 inper year

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 38 °F, low 17 °F 38°17° JanFebruary: average high 40 °F, low 19 °F 40°19° FebMarch: average high 46 °F, low 26 °F 46°26° MarApril: average high 57 °F, low 36 °F 57°36° AprMay: average high 67 °F, low 46 °F 67°46° MayJune: average high 76 °F, low 55 °F 76°55° JunJuly: average high 82 °F, low 61 °F 82°61° JulAugust: average high 81 °F, low 60 °F 81°60° AugSeptember: average high 74 °F, low 52 °F 74°52° SepOctober: average high 63 °F, low 41 °F 63°41° OctNovember: average high 52 °F, low 32 °F 52°32° NovDecember: average high 43 °F, low 24 °F 43°24° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 4.44 in precipitation, 13.5 in snowfall 4.4❄14 JanFebruary: 3.76 in precipitation, 13.7 in snowfall 3.8❄14 FebMarch: 5.80 in precipitation, 6.8 in snowfall 5.8❄7 MarApril: 4.83 in precipitation, 1.3 in snowfall 4.8❄1 AprMay: 3.59 in precipitation 3.6 MayJune: 4.06 in precipitation 4.1 JunJuly: 3.33 in precipitation 3.3 JulAugust: 3.77 in precipitation 3.8 AugSeptember: 4.17 in precipitation 4.2 SepOctober: 4.95 in precipitation, 0.1 in snowfall 5.0 OctNovember: 4.43 in precipitation, 0.4 in snowfall 4.4 NovDecember: 5.26 in precipitation, 5.7 in snowfall 5.3❄6 Dec

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

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

023446b
Middleboro, MA · 2 mi
023496b
Middleboro, MA · 2 mi
023556b
North Carver, MA · 4 mi
023486b
Lakeville, MA · 5 mi
023476b
Lakeville, MA · 5 mi
023306b
Carver, MA · 6 mi
023676b
Plympton, MA · 7 mi
027186b
East Taunton, MA · 7 mi

All 3 ZIP codes in Middleboro → · Massachusetts planting zones →

Questions about 02346

What planting zone is ZIP code 02346?

ZIP code 02346 (Middleboro, 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 Middleboro, MA?

The median last spring frost (32 °F) near 02346 is April 23; after May 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Middleboro station.

When is the first frost in Middleboro, MA?

The median first fall frost near 02346 is October 16, giving a median frost-free growing season of 174 days.

When should I plant tomatoes in 02346?

Start tomato seeds indoors around Feb 26 – Mar 12 and set transplants outside around Apr 30 – May 14, one to three weeks after the median last frost.

How much rain and snow does 02346 get?

About 52.4 inches of precipitation a year and 42 inches of snowfall (NOAA 1991–2020 normals, Middleboro station).

How hot do summers get in Middleboro, MA?

The average high peaks at 82 °F in July, with about 8 days a year at 90 °F or more.

What kind of soil does 02346 have?

The USDA soil survey maps Tihonet at the center of ZIP 02346: moderately decomposed plant material, poorly drained.

Did spring come early in Middleboro, MA in 2026?

Spring leaf-out near 02346 came on Apr 2 in 2026, 3 days earlier than the 1991–2020 average (Apr 5), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Middleboro, MA?

Long-day onions: the longest day near 02346 is 15 h 14 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).