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

Planting zone for 02703 — Attleboro, MA

ZIP code 02703 (Attleboro, Bristol County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 27 and the first fall frost October 15.

Where ZIP 02703 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 27

First frostOct 15

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 Attleboro, 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 Attleboro, MA

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 10only 10% chance of frost after

First fall frostOctober 15median — 10% chance by Oct 1

Growing season168 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 16 and returns around October 28.

From the NOAA station Norton W, MA — 8 miles away, elevation 95 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 02703

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 20 – Sep 3

GarlicPlant cloves · Oct 1 – Nov 5

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 27) and first fall frost (Oct 15) 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 02703 came on Apr 5 — about the same time as the 1991–2020 average (Apr 5).

average
Apr 52026
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.

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 Attleboro, MA.

Soil in Attleboro, MA

The soil mapped at the center of ZIP 02703 is Charlton — moderately decomposed plant material, well drained.

TextureModerately decomposed plant materialtop layer

DrainageWell drainednatural drainage class

Organic matter95%high

Hydrologic groupBwater soaks in moderately

Farmland classNot prime farmlandUSDA classification

Map unit: Charlton-Paxton fine sandy loams, 8 to 15 percent slopes, very rocky.

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 02703; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Attleboro, MA

Summer high83 °Faverage high, July

Winter low18 °Faverage low, January

Hot days12days a year at 90 °F or more

Freezing nights147nights a year at 32 °F or less

Growing degree days2,626base 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)

Precipitation50.6 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Norton W, MA (8 mi away); precipitation: Rehoboth 2.1 N, MA (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

027636b

Attleboro Falls, MA · 3 mi

027606b

North Attleboro, MA · 3 mi

027126b

Chartley, MA · 4 mi

027616b

North Attleboro, MA · 4 mi

028617a

Pawtucket, RI · 5 mi

028637a

Central Falls, RI · 6 mi

027626b

Plainville, MA · 6 mi

028627a

Pawtucket, RI · 6 mi

Massachusetts planting zones →

Questions about 02703

What planting zone is ZIP code 02703?

ZIP code 02703 (Attleboro, 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 Attleboro, MA?

The median last spring frost (32 °F) near 02703 is April 27; after May 10 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Norton W station.

When is the first frost in Attleboro, MA?

The median first fall frost near 02703 is October 15, giving a median frost-free growing season of 168 days.

When should I plant tomatoes in 02703?

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 02703 get?

About 50.6 inches of precipitation a year (NOAA 1991–2020 normals, Rehoboth 2.1 N station).

How hot do summers get in Attleboro, MA?

The average high peaks at 83 °F in July, with about 12 days a year at 90 °F or more.

What kind of soil does 02703 have?

The USDA soil survey maps Charlton at the center of ZIP 02703: moderately decomposed plant material, well drained.

Did spring come early in Attleboro, MA in 2026?

Spring leaf-out near 02703 came on Apr 5 in 2026, about the same as the 1991–2020 average (Apr 5), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Attleboro, MA?

Long-day onions: the longest day near 02703 is 15 h 14 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).