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

Planting zone for Westfield, MA

Westfield, MA is in USDA zone 6a across its 2 ZIP codes. The median last spring frost is May 3 and the first fall frost October 8.

Westfield 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.

Zone6a−10 to −5 °F
ZIP codes2
Last frostMay 3
First frostOct 8
Growing season158 days

6a 2 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 Westfield, MA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 3median — 50% chance of a later frost
Safe for tender plantsMay 17only 10% chance of frost after
First fall frostOctober 8median — 10% chance by Sep 26
Growing season158 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 21 and returns around October 20.

From the NOAA station Westfield Barnes Municipal Airport, MA, elevation 272 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 Westfield

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 22 – Apr 5
SpinachSow outdoors · Mar 22 – Apr 12
Broccoli, cabbageStart indoors · Feb 22 – Mar 8
Broccoli, cabbageTransplant · Apr 12 – Apr 26
Onion setsPlant outdoors · Apr 5 – Apr 19
PotatoesPlant outdoors · Apr 12 – Apr 26
LettuceSow outdoors · Apr 5 – Apr 19
Carrots, beetsSow outdoors · Apr 12 – Apr 26
TomatoesStart indoors · Mar 8 – Mar 22
TomatoesTransplant · May 10 – May 24
Peppers, eggplantStart indoors · Feb 22 – Mar 8
Peppers, eggplantTransplant · May 17 – May 31
BeansSow outdoors · May 10 – May 24
Sweet cornSow outdoors · May 10 – May 24
Cucumbers, squashSow outdoors · May 10 – May 24
Fall lettuce, spinachSow outdoors · Aug 13 – Aug 27
GarlicPlant cloves · Sep 24 – Oct 29
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 3) and first fall frost (Oct 8) 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 01086 came on Apr 5 — 8 days earlier than the 1991–2020 average (Apr 13).

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 6a in Massachusetts

544 plants native to the lower 48 states, recorded in Massachusetts, and rated by the USDA to survive −10 °F or colder — the bottom of zone 6a. 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 186

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 157

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 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °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 Westfield, MA.

Soil in Westfield, MA

The soil mapped at the center of ZIP 01086 is Hollis — slightly decomposed plant material, somewhat excessively drained.

TextureSlightly decomposed plant materialtop layer
DrainageSomewhat excessively drainednatural drainage class
Organic matter95%high
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Hollis-Chatfield association, 15 to 45 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 01086; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Westfield, MA

Summer high84 °Faverage high, July
Winter low16 °Faverage low, January
Hot days14days a year at 90 °F or more
Freezing nights143nights a year at 32 °F or less
Growing degree days2,704base 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)
Precipitation52.4 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 33 °F, low 16 °F 33°16° JanFebruary: average high 37 °F, low 17 °F 37°17° FebMarch: average high 45 °F, low 25 °F 45°25° MarApril: average high 58 °F, low 35 °F 58°35° AprMay: average high 70 °F, low 46 °F 70°46° MayJune: average high 78 °F, low 56 °F 78°56° JunJuly: average high 84 °F, low 61 °F 84°61° JulAugust: average high 82 °F, low 59 °F 82°59° AugSeptember: average high 75 °F, low 52 °F 75°52° SepOctober: average high 62 °F, low 40 °F 62°40° OctNovember: average high 49 °F, low 31 °F 49°31° NovDecember: average high 38 °F, low 22 °F 38°22° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 3.98 in precipitation 4.0 JanFebruary: 3.61 in precipitation 3.6 FebMarch: 3.92 in precipitation 3.9 MarApril: 4.74 in precipitation 4.7 AprMay: 4.20 in precipitation 4.2 MayJune: 5.08 in precipitation 5.1 JunJuly: 4.26 in precipitation 4.3 JulAugust: 3.80 in precipitation 3.8 AugSeptember: 4.38 in precipitation 4.4 SepOctober: 5.18 in precipitation 5.2 OctNovember: 4.06 in precipitation 4.1 NovDecember: 5.15 in precipitation 5.2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Westfield 3 Sw, MA (6 mi away); precipitation: Westfield 3 Sw, MA (6 mi away). Daylight is calculated from latitude.

ZIP codes in Westfield

010856a
−10 to −5 °F
010866a
−10 to −5 °F

Massachusetts planting zones →

Questions about Westfield

What planting zone is Westfield, MA?

Westfield, MA is in USDA hardiness zone 6a on the 2023 map (6a: −10 to −5 °F).

When is the last frost in Westfield, MA?

The median last spring frost is May 3 and the median first fall frost is October 8 (NOAA 1991–2020 normals, Westfield Barnes Municipal Airport station).

When can I plant a garden in Westfield, MA?

Cool-season crops like peas and spinach go in around Mar 22 – Apr 12; tomatoes, peppers, beans and squash after about May 10, once frost risk has passed.

What kind of onions grow in Westfield, MA?

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

How much rain and snow does Westfield, MA get?

About 52.4 inches of precipitation a year (NOAA 1991–2020 normals).