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

Planting zone for 01244 — Mill River, MA

ZIP code 01244 (Mill River, Berkshire County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 3 and the first fall frost October 11.

Where ZIP 01244 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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostMay 3
First frostOct 11
2012 zone5b

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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Mill River, 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 Mill River, 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 11median — 10% chance by Oct 1
Growing season161 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 20 and returns around October 25.

From the NOAA station Norfolk 2 Sw, CT — 11 miles away, elevation 1,339 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 01244

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 16 – Aug 30
GarlicPlant cloves · Sep 27 – Nov 1
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 3) and first fall frost (Oct 11) 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 01244 came on Apr 12 — 4 days earlier than the 1991–2020 average (Apr 16).

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 5b in Massachusetts

527 plants native to the lower 48 states, recorded in Massachusetts, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. 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 104

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 181

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 154

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 7

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 honeysuckle16 ft · blooms late summer · low shade tolerance · to −33 °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 Mill River, MA.

Soil in Mill River, MA

The soil mapped at the center of ZIP 01244 is Berkshire — slightly decomposed plant material, well drained.

TextureSlightly decomposed plant materialtop layer
pH3.5strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter85%high
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Berkshire-Marlow association, 15 to 45 percent slopes, extremely stony.

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 01244; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Mill River, MA

Summer high78 °Faverage high, July
Winter low14 °Faverage low, January
Hot days1days a year at 90 °F or more
Freezing nights152nights a year at 32 °F or less
Growing degree days2,192base 50 °F — the season’s usable heat
Longest day15 h 15 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)
Precipitation52.9 inper year, rain and melted snow
Snowfall75 inper year; 98 days with snow on the ground

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 30 °F, low 14 °F 30°14° JanFebruary: average high 32 °F, low 15 °F 32°15° FebMarch: average high 40 °F, low 23 °F 40°23° MarApril: average high 54 °F, low 34 °F 54°34° AprMay: average high 65 °F, low 45 °F 65°45° MayJune: average high 73 °F, low 55 °F 73°55° JunJuly: average high 78 °F, low 60 °F 78°60° JulAugust: average high 76 °F, low 58 °F 76°58° AugSeptember: average high 69 °F, low 51 °F 69°51° SepOctober: average high 57 °F, low 40 °F 57°40° OctNovember: average high 45 °F, low 30 °F 45°30° NovDecember: average high 35 °F, low 21 °F 35°21° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.97 in precipitation, 17.8 in snowfall 4.0❄18 JanFebruary: 3.33 in precipitation, 17.5 in snowfall 3.3❄18 FebMarch: 4.21 in precipitation, 14.9 in snowfall 4.2❄15 MarApril: 3.93 in precipitation, 3.9 in snowfall 3.9❄4 AprMay: 4.13 in precipitation 4.1 MayJune: 4.96 in precipitation 5.0 JunJuly: 4.77 in precipitation 4.8 JulAugust: 4.67 in precipitation 4.7 AugSeptember: 4.90 in precipitation 4.9 SepOctober: 5.14 in precipitation, 1.4 in snowfall 5.1❄1 OctNovember: 4.07 in precipitation, 4.4 in snowfall 4.1❄4 NovDecember: 4.86 in precipitation, 15 in snowfall 4.9❄15 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Norfolk 2 Sw, CT (11 mi away); precipitation: Norfolk 2 Sw, CT (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

012596a
Southfield, MA · 4 mi
012226a
Ashley Falls, MA · 4 mi
012306a
Great Barrington, MA · 5 mi
012576a
Sheffield, MA · 5 mi
060186a
Canaan, CT · 6 mi
012455b
Monterey, MA · 6 mi
060246a
East Canaan, CT · 8 mi
012556a
Sandisfield, MA · 8 mi

Massachusetts planting zones →

Questions about 01244

What planting zone is ZIP code 01244?

ZIP code 01244 (Mill River, MA) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in Mill River, MA?

The median last spring frost (32 °F) near 01244 is May 3; after May 17 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Norfolk 2 Sw station.

When is the first frost in Mill River, MA?

The median first fall frost near 01244 is October 11, giving a median frost-free growing season of 161 days.

When should I plant tomatoes in 01244?

Start tomato seeds indoors around Mar 8 – Mar 22 and set transplants outside around May 10 – May 24, one to three weeks after the median last frost.

How much rain and snow does 01244 get?

About 52.9 inches of precipitation a year and 75 inches of snowfall (NOAA 1991–2020 normals, Norfolk 2 Sw station).

How hot do summers get in Mill River, MA?

The average high peaks at 78 °F in July, with about 1 days a year at 90 °F or more.

What kind of soil does 01244 have?

The USDA soil survey maps Berkshire at the center of ZIP 01244: slightly decomposed plant material, well drained, pH about 3.5 (strongly acidic).

Did spring come early in Mill River, MA in 2026?

Spring leaf-out near 01244 came on Apr 12 in 2026, 4 days earlier than the 1991–2020 average (Apr 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Mill River, MA?

Long-day onions: the longest day near 01244 is 15 h 15 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).