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

Planting zone for 02818 — East Greenwich, RI

ZIP code 02818 (East Greenwich, Kent County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 22 and the first fall frost October 20.

Where ZIP 02818 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.

Zone7a0 to 5 °F
Coldest night−17.8 to −15 °C
Last frostApr 22
First frostOct 20
2012 zone6b

Was 6b on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for East Greenwich, RI…

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 East Greenwich, RI

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 22median — 50% chance of a later frost
Safe for tender plantsMay 4only 10% chance of frost after
First fall frostOctober 20median — 10% chance by Oct 5
Growing season179 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 10 and returns around November 1.

From the NOAA station Coventry 2, RI — 4 miles away, elevation 279 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 02818

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 11 – Mar 25
SpinachSow outdoors · Mar 11 – Apr 1
Broccoli, cabbageStart indoors · Feb 11 – Feb 25
Broccoli, cabbageTransplant · Apr 1 – Apr 15
Onion setsPlant outdoors · Mar 25 – Apr 8
PotatoesPlant outdoors · Apr 1 – Apr 15
LettuceSow outdoors · Mar 25 – Apr 8
Carrots, beetsSow outdoors · Apr 1 – Apr 15
TomatoesStart indoors · Feb 25 – Mar 11
TomatoesTransplant · Apr 29 – May 13
Peppers, eggplantStart indoors · Feb 11 – Feb 25
Peppers, eggplantTransplant · May 6 – May 20
BeansSow outdoors · Apr 29 – May 13
Sweet cornSow outdoors · Apr 29 – May 13
Cucumbers, squashSow outdoors · Apr 29 – May 13
Fall lettuce, spinachSow outdoors · Aug 25 – Sep 8
GarlicPlant cloves · Oct 6 – Nov 10
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 22) and first fall frost (Oct 20) 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 02818 came on Apr 5 — about the same time as the 1991–2020 average (Apr 4).

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 Rhode Island

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

Trees 56

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 95

Allegheny 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 °FAmerican hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °F

Wildflowers & perennials 160

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °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 pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °F

Grasses 132

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °FAtlantic mannagrass3 ft · blooms summer · low shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °FBicknell's sedge3 ft · blooms late spring · low shade tolerance · to −38 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °F

Vines 8

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 °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 East Greenwich, RI.

Soil in East Greenwich, RI

The soil mapped at the center of ZIP 02818 is Bridgehampton — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH5.3strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter4%moderate
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Bridgehampton-Charlton complex, extremely stony, 3 to 15 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 02818; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in East Greenwich, RI

Summer high85 °Faverage high, July
Winter low18 °Faverage low, January
Hot days22days a year at 90 °F or more
Freezing nights135nights a year at 32 °F or less
Growing degree days2,940base 50 °F — the season’s usable heat
Longest day15 h 12 mindaylight on June 21
Shortest day9 h 09 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation51.4 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 36 °F, low 18 °F 36°18° JanFebruary: average high 39 °F, low 20 °F 39°20° FebMarch: average high 47 °F, low 26 °F 47°26° MarApril: average high 61 °F, low 36 °F 61°36° AprMay: average high 71 °F, low 47 °F 71°47° MayJune: average high 80 °F, low 57 °F 80°57° JunJuly: average high 85 °F, low 64 °F 85°64° JulAugust: average high 82 °F, low 62 °F 82°62° AugSeptember: average high 74 °F, low 54 °F 74°54° SepOctober: average high 62 °F, low 42 °F 62°42° OctNovember: average high 52 °F, low 32 °F 52°32° NovDecember: average high 42 °F, low 24 °F 42°24° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 4.20 in precipitation 4.2 JanFebruary: 3.52 in precipitation 3.5 FebMarch: 5.25 in precipitation 5.3 MarApril: 4.66 in precipitation 4.7 AprMay: 3.61 in precipitation 3.6 MayJune: 4.18 in precipitation 4.2 JunJuly: 3.33 in precipitation 3.3 JulAugust: 4.11 in precipitation 4.1 AugSeptember: 4.20 in precipitation 4.2 SepOctober: 4.94 in precipitation 4.9 OctNovember: 4.40 in precipitation 4.4 NovDecember: 5.01 in precipitation 5.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Coventry 2, RI (4 mi away); precipitation: East Greenwich 2.3 Ese, RI (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

028936b
West Warwick, RI · 3 mi
028527a
North Kingstown, RI · 4 mi
028867a
Warwick, RI · 4 mi
028877a
Warwick, RI · 5 mi
028897a
Warwick, RI · 7 mi
028236b
Fiskeville, RI · 7 mi
028226b
Exeter, RI · 7 mi
028166b
Coventry, RI · 8 mi

Rhode Island planting zones →

Questions about 02818

What planting zone is ZIP code 02818?

ZIP code 02818 (East Greenwich, RI) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in East Greenwich, RI?

The median last spring frost (32 °F) near 02818 is April 22; after May 4 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Coventry 2 station.

When is the first frost in East Greenwich, RI?

The median first fall frost near 02818 is October 20, giving a median frost-free growing season of 179 days.

When should I plant tomatoes in 02818?

Start tomato seeds indoors around Feb 25 – Mar 11 and set transplants outside around Apr 29 – May 13, one to three weeks after the median last frost.

How much rain and snow does 02818 get?

About 51.4 inches of precipitation a year (NOAA 1991–2020 normals, East Greenwich 2.3 Ese station).

How hot do summers get in East Greenwich, RI?

The average high peaks at 85 °F in July, with about 22 days a year at 90 °F or more.

What kind of soil does 02818 have?

The USDA soil survey maps Bridgehampton at the center of ZIP 02818: silt loam, well drained, pH about 5.3 (strongly acidic).

Did spring come early in East Greenwich, RI in 2026?

Spring leaf-out near 02818 came on Apr 5 in 2026, about the same as the 1991–2020 average (Apr 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in East Greenwich, RI?

Long-day onions: the longest day near 02818 is 15 h 12 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 02818 change?

Yes. The 2012 USDA map put 02818 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.