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Last and first frost dates in Trois-Rivières

Canada

In Trois-Rivières the last spring frost usually comes around 29 April and the first autumn frost around 29 October, which leaves about 183 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground from 25 May to 9 July.

Last spring frostaround 29 April
First autumn frostaround 29 October
Frost-free days183 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 Trois-Rivières?

The last frost in Trois-Rivières usually comes around 29 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 8 April, while corn waits until 16 May. The first autumn frost follows around 29 October, about 183 days later: harvest or cover frost-tender crops before then.

When to sow and plant

CropSow for seedlingsPlant out in a greenhouseOpen ground
Achocha7 March – 21 July16 April – 30 August7 May – 30 August
Ageratumfrom 9 March—from 25 May
Arugula——sow 8 April – 24 September
Basil2 April – 27 August10 May – 4 October31 May – 4 October
Beet——sow 8 April – 30 August
Bell Pepper11 March – 10 May10 May – 9 July31 May – 9 July
Black-eyed Susanfrom 13 February—from 7 May
Bok Choy12 March – 7 September16 April – 12 October7 May – 12 October
Borage——sow 6 May – 4 September
Broad bean——sow 8 April – 21 July
Broccoli——sow 8 April – 14 July
Brussels Sprouts1 February – 11 June18 March – 26 July8 April – 26 July
Busy Lizziefrom 11 February—from 6 May
Cabbage——sow 8 April – 21 June
Calendula——sow from 8 April
Carrot——sow 8 April – 6 August
Cauliflower4 February – 14 July18 March – 25 August8 April – 25 August
Celeriac29 January – 11 May16 April – 27 July7 May – 27 July
Celery29 January – 21 May16 April – 6 August7 May – 6 August
Celosiafrom 23 Marchfrom 7 Mayfrom 28 May
Chamomile——sow 8 April – 25 August
Chayote27 January – 4 May25 April – 31 July16 May – 31 July
Chickpea——sow 8 April – 11 July
Chicory21 February – 5 August—8 April – 30 August
Chili Pepper11 March – 16 June10 May – 15 August31 May – 15 August
China asterfrom 19 Marchfrom 10 Mayfrom 31 May
Chives——sow 8 April – 16 August
Cilantro——sow 8 April – 26 August
Corn——sow 16 May – 11 July
Corn poppy——sow from 8 April
Cosmosfrom 23 Marchfrom 7 Mayfrom 28 May
Cucumber12 April – 17 July10 May – 14 August31 May – 14 August
Daikon——sow 8 April – 23 August
Delphiniumfrom 18 January—from 8 April
Dill——sow 8 April – 5 September
Edging lobeliafrom 12 February—from 7 May
Eggplant11 March – 10 May10 May – 9 July31 May – 9 July
Florence fennel2 March – 21 July16 April – 4 September7 May – 4 September
Foxglovefrom 31 December—from 8 April
Garden sorrel——sow 8 April – 24 August
Green Beans——sow 28 May – 19 July
Hollyhock——sow from 8 April
Hyssop——sow 8 April – 17 July
Kale——sow 8 April – 18 August
Kiwano2 April – 24 July4 May – 25 August25 May – 25 August
Kohlrabi——sow 8 April – 28 August
Leek7 January – 2 May18 March – 11 July8 April – 11 July
Lemon balm——sow 8 April – 20 August
Lettuce——sow 8 April – 2 September
Lisianthusfrom 21 Decemberfrom 18 Marchfrom 8 April
Lovage——sow from 8 April
Luffa29 March – 18 May10 May – 29 June31 May – 29 June
Marigoldfrom 5 Marchfrom 16 Aprilfrom 7 May
Marjoram11 March – 5 August—31 May – 4 October
Melon12 April – 4 July10 May – 1 August31 May – 1 August
Microgreens——sow 28 May – 15 October
Moringa12 April – 10 August6 June – 4 October27 June – 4 October
Moss rosefrom 18 February—from 6 May
Mustard greens——sow 8 April – 14 September
Napa cabbage14 March – 15 August16 April – 17 September7 May – 17 September
Nasturtiumfrom 9 Marchfrom 16 Aprilfrom 7 May
Okra29 March – 29 July10 May – 9 September31 May – 9 September
Oregano17 January – 26 July18 March – 24 September8 April – 24 September
Pansyfrom 21 Januaryfrom 18 Marchfrom 8 April
Parsley——sow 8 April – 14 August
Parsnip——sow 8 April – 3 July
Peanut3 April – 24 June10 May – 31 July31 May – 31 July
Peas——sow 8 April – 16 August
Petuniafrom 8 Marchfrom 10 Mayfrom 31 May
Physalis20 March – 21 June4 May – 5 August25 May – 5 August
Pumpkin29 March – 23 May10 May – 4 July31 May – 4 July
Purple coneflowerfrom 15 January—from 8 April
Radish——sow 8 April – 29 September
Sage28 January – 22 July18 March – 9 September8 April – 9 September
Scarlet sagefrom 13 March—from 25 May
Snapdragonfrom 12 Januaryfrom 18 Marchfrom 8 April
Soybean——sow 31 May – 10 August
Spinach——sow 8 April – 4 September
Stevia16 March – 12 June4 May – 31 July25 May – 31 July
Stock——sow from 8 April
Sunflower——sow from 28 May
Sweet alyssum——sow from 8 April
Sweet Corn5 April – 5 August27 April – 27 August18 May – 27 August
Sweet peafrom 4 Februaryfrom 18 Marchfrom 8 April
Sweet William——sow from 8 April
Swiss Chard——sow 8 April – 30 August
Thyme——sow 8 April – 11 July
Tomato13 March – 18 May4 May – 9 July25 May – 9 July
Turnip——sow 8 April – 1 September
Watercress——sow 8 April – 12 September
Watermelon12 April – 22 June10 May – 20 July31 May – 20 July
Zinniafrom 2 Mayfrom 6 Junefrom 27 June
Zucchini19 April – 22 July10 May – 12 August31 May – 12 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 Trois-Rivières

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 8 days after the last spring frost and 15 °C 26 days after it.

SoilDateAgainst the last spring frost
5 °C17 April12 days earlier
10 °C7 May8 days later
15 °C25 May26 days later
18 °C31 May32 days later

Frost dates near Trois-Rivières

Of the nearest cities on our list, the last spring frost ends earliest in Burlington (22 April) and latest in Montpelier (8 May).

CityDistanceLast spring frostFirst autumn frost
Quebec City114 km5 May28 October
Sherbrooke116 km8 May27 October
Montreal123 km27 April1 November
Burlington213 km22 April3 November
Montpelier231 km8 May17 October

Seeds, seedlings and markets in Trois-Rivières

Within 15 km of Trois-Rivières OpenStreetMap lists 1 garden centre, 2 farm-supply shops, 1 market and 2 farm shops (collected 20 October 2026). The nearest garden centre to the city centre is Maison Chaleur et Confort, 6 km away.

Places: © OpenStreetMap contributors, ODbL.

What to grow at home in winter in Trois-Rivières

Frosts in Trois-Rivières usually come from about 29 October to about 29 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 Trois-Rivières by month

Average weather in Trois-Rivières over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: June–September (21–26.2 °C). Nights average below 0 °C in November–March (-13.7–-2 °C). About 1210 mm of rain falls in a year, on 150 days; August is the wettest month (131 mm) and January the driest (77 mm).

MonthDay, °CNight, °CRain, mmRainy days
January-4.4-13.77711
February-2.2-12.87912
March3.2-6.68612
April10.7011013
May19.27.99312
June23.613.712514
July26.21713015
August24.815.913114
September2112789
October14.46.311712
November5-29313
December-1.4-9.79113

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 29 September
Crocus29 September – 8 November
Daffodil29 September – 8 November
Garlic29 September – 8 November
Grape hyacinthby 29 September
Helleboreby 29 September
Hyacinth29 September – 8 November
Lilyby 29 September
Ornamental onionby 29 September
Peonyby 29 September
Saffronby 29 September
Snowdropby 29 September
Tulip29 September – 8 November
Wild garlicby 29 September

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).