Greenly Garden
Get the app
EN

Last and first frost dates in Worcester (United States)

United States

In Worcester (United States) the last spring frost usually comes around 11 April and the first autumn frost around 8 November, which leaves about 211 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground from 20 May to 19 July.

Last spring frostaround 11 April
First autumn frostaround 8 November
Frost-free days211 days

Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.

When is the last frost in Worcester (United States)?

The last frost in Worcester (United States) usually comes around 11 April: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 21 March, while corn waits until 4 May. The first autumn frost follows around 8 November, about 211 days later: harvest or cover frost-tender crops before then.

When to sow and plant

CropSow for seedlingsPlant out in a greenhouseOpen ground
Achocha16 February – 31 July28 March – 9 September18 April – 9 September
Ageratumfrom 4 March—from 20 May
Arugula——sow 21 March – 4 October
Basil2 April – 6 September10 May – 14 October31 May – 14 October
Beet——sow 21 March – 9 September
Bell Pepper11 March – 20 May10 May – 19 July31 May – 19 July
Black-eyed Susanfrom 25 January—from 18 April
Bok Choy21 February – 17 September28 March – 22 October18 April – 22 October
Borage——sow 18 April – 14 September
Broad bean——sow 21 March – 31 July
Broccoli——sow 21 March – 24 July
Brussels Sprouts14 January – 21 June28 February – 5 August21 March – 5 August
Busy Lizziefrom 24 January—from 18 April
Cabbage——sow 21 March – 1 July
Calendula——sow from 21 March
Carrot——sow 21 March – 16 August
Cauliflower17 January – 24 July28 February – 4 September21 March – 4 September
Celeriac10 January – 21 May28 March – 6 August18 April – 6 August
Celery10 January – 31 May28 March – 16 August18 April – 16 August
Celosiafrom 16 Marchfrom 30 Aprilfrom 21 May
Chamomile——sow 21 March – 4 September
Chayote15 January – 14 May13 April – 10 August4 May – 10 August
Chickpea——sow 21 March – 21 July
Chicory3 February – 15 August—21 March – 9 September
Chili Pepper11 March – 26 June10 May – 25 August31 May – 25 August
China asterfrom 19 Marchfrom 10 Mayfrom 31 May
Chives——sow 21 March – 26 August
Cilantro——sow 21 March – 5 September
Corn——sow 4 May – 21 July
Corn poppy——sow from 21 March
Cosmosfrom 16 Marchfrom 30 Aprilfrom 21 May
Cucumber12 April – 27 July10 May – 24 August31 May – 24 August
Daikon——sow 21 March – 2 September
Delphiniumfrom 31 December—from 21 March
Dill——sow 21 March – 15 September
Edging lobeliafrom 24 January—from 18 April
Eggplant11 March – 20 May10 May – 19 July31 May – 19 July
Florence fennel11 February – 31 July28 March – 14 September18 April – 14 September
Foxglovefrom 13 December—from 21 March
Garden sorrel——sow 21 March – 3 September
Green Beans——sow 21 May – 29 July
Hollyhock——sow from 21 March
Hyssop——sow 21 March – 27 July
Kale——sow 21 March – 28 August
Kiwano28 March – 3 August29 April – 4 September20 May – 4 September
Kohlrabi——sow 21 March – 7 September
Leek20 December – 12 May28 February – 21 July21 March – 21 July
Lemon balm——sow 21 March – 30 August
Lettuce——sow 21 March – 12 September
Lisianthusfrom 3 Decemberfrom 28 Februaryfrom 21 March
Lovage——sow from 21 March
Luffa29 March – 28 May10 May – 9 July31 May – 9 July
Marigoldfrom 14 Februaryfrom 28 Marchfrom 18 April
Marjoram11 March – 15 August—31 May – 14 October
Melon12 April – 14 July10 May – 11 August31 May – 11 August
Microgreens——sow 21 May – 25 October
Moringa3 April – 20 August28 May – 14 October18 June – 14 October
Moss rosefrom 31 January—from 18 April
Mustard greens——sow 21 March – 24 September
Napa cabbage23 February – 25 August28 March – 27 September18 April – 27 September
Nasturtiumfrom 18 Februaryfrom 28 Marchfrom 18 April
Okra29 March – 8 August10 May – 19 September31 May – 19 September
Oregano30 December – 5 August28 February – 4 October21 March – 4 October
Pansyfrom 3 Januaryfrom 28 Februaryfrom 21 March
Parsley——sow 21 March – 24 August
Parsnip——sow 21 March – 13 July
Peanut3 April – 4 July10 May – 10 August31 May – 10 August
Peas——sow 21 March – 26 August
Petuniafrom 8 Marchfrom 10 Mayfrom 31 May
Physalis15 March – 1 July29 April – 15 August20 May – 15 August
Pumpkin29 March – 2 June10 May – 14 July31 May – 14 July
Purple coneflowerfrom 28 December—from 21 March
Radish——sow 21 March – 9 October
Sage10 January – 1 August28 February – 19 September21 March – 19 September
Scarlet sagefrom 8 March—from 20 May
Snapdragonfrom 25 Decemberfrom 28 Februaryfrom 21 March
Soybean——sow 31 May – 20 August
Spinach——sow 21 March – 14 September
Stevia11 March – 22 June29 April – 10 August20 May – 10 August
Stock——sow from 21 March
Sunflower——sow from 21 May
Sweet alyssum——sow from 21 March
Sweet Corn2 April – 15 August24 April – 6 September15 May – 6 September
Sweet peafrom 17 Januaryfrom 28 Februaryfrom 21 March
Sweet William——sow from 21 March
Swiss Chard——sow 21 March – 9 September
Thyme——sow 21 March – 21 July
Tomato8 March – 28 May29 April – 19 July20 May – 19 July
Turnip——sow 21 March – 11 September
Watercress——sow 21 March – 22 September
Watermelon12 April – 2 July10 May – 30 July31 May – 30 July
Zinniafrom 23 Aprilfrom 28 Mayfrom 18 June
Zucchini19 April – 1 August10 May – 22 August31 May – 22 August

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

When the soil warms up in Worcester (United States)

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 7 days after the last spring frost and 15 °C 39 days after it.

SoilDateAgainst the last spring frost
5 °C15 March27 days earlier
10 °C18 April7 days later
15 °C20 May39 days later
18 °C31 May50 days later

Frost dates near Worcester (United States)

Of the nearest cities on our list, the last spring frost ends earliest in Boston (9 April) and latest in Concord (22 April).

CityDistanceLast spring frostFirst autumn frost
Providence60 km11 April8 November
Boston62 km9 April13 November
Manchester (United States)85 km22 April2 November
Hartford93 km13 April8 November
Concord107 km22 April31 October

Seeds, seedlings and markets in Worcester (United States)

Within 15 km of Worcester (United States) OpenStreetMap lists 3 garden centres, 1 plant nursery, 5 markets and 4 farm shops (collected 28 October 2026). The nearest garden centre to the city centre is The Plant Ward, 4 km away.

Places: © OpenStreetMap contributors, ODbL.

What to grow at home in winter in Worcester (United States)

Frosts in Worcester (United States) usually come from about 8 November to about 11 April. These plants have indoor care in their Greenly cards and are harvested quickly, so they can be sown on a windowsill in winter.

Weather in Worcester (United States) by month

Average weather in Worcester (United States) over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: June–September (23.1–28.6 °C). Nights average below 0 °C in December–March (-5.5–-1.7 °C). About 1243 mm of rain falls in a year, on 132 days; July is the wettest month (130 mm) and November the driest (81 mm).

MonthDay, °CNight, °CRain, mmRainy days
January2.6-5.59910
February4.6-58510
March8.3-1.710711
April13.83.511313
May19.99.410113
June25.514.98812
July28.618.613014
August27.417.78511
September23.114.211510
October178.611410
November9.91.8818
December4.5-3.312510

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).

Planted in autumn

CropWhen to plant
Bearded Irisby 9 October
Crocus9 October – 11 December
Daffodil9 October – 11 December
Garlic9 October – 11 December
Grape hyacinthby 9 October
Helleboreby 9 October
Hyacinth9 October – 11 December
Lilyby 9 October
Ornamental onionby 9 October
Peonyby 9 October
Saffronby 9 October
Snowdropby 9 October
Tulip9 October – 11 December
Wild garlicby 9 October

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).