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When to plant crocuses in Trois-Rivières: 29 September – 8 November

In Trois-Rivières, crocus: plant from 29 September to about 8 November. For planting stock, the places nearby include Maison Chaleur et Confort (garden centre, 6 km) and Ferme horticole Gagnon (farm shop, 8 km); addresses and opening hours are below.

Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

The date is about two weeks before the average daily temperature here falls below 0 °C (ten years of weather): an estimate, not the day the ground freezes, and a cold spell can freeze it earlier. Sources: Iowa State University Extension, Wisconsin Horticulture Extension, UNH Extension, RHS, how the ground freezes (NRC Canada, CBD-26).

Crocus in Trois-Rivières: soil, season and weather

Nights then average below 0 °C in November–March; the coldest, January, averages -13.7 °C.

Planting29 September – 8 November
First autumn frost29 October
Coldest nightsJanuary, -13.7 °C
Soil back at 1 °C in spring4 April
Daylight11:51 on 29 September
Daylight at the winter solstice8:36

The same dates in Trois-Rivières hold for Garlic, Tulip, Daffodil and Hyacinth.

Crocus in Trois-Rivières: depth, winter cold, pests and pets

Plant Dutch crocuses (Crocus vernus) about 12 cm deep and 9 cm apart; smaller species go 7–10 cm deep (RHS).

In Trois-Rivières the average daily temperature stays at 10 °C or lower for about 28 weeks a year (our estimate from ten years of monthly weather). For this bulb Wisconsin Horticulture Extension gives a cold period of 15–17 weeks at about 2–10 °C. The winter here gives that in the ground, so the bulbs need no pre-chilling.

Crocuses multiply on their own (they naturalise); in a lawn, hold off mowing until their leaves die back (RHS).

Birds, squirrels and rodents damage crocuses; planting under metal mesh may reduce losses (RHS). Spring crocus gives dogs and cats vomiting and diarrhoea; do not confuse it with autumn crocus (Colchicum), which is very toxic (Pet Poison Helpline).

Sources: RHS, Wisconsin Horticulture Extension, Pet Poison Helpline.

Crocus in nearby cities

Around Trois-Rivières, Montpelier is 12 days earlier and Burlington 5 days later.

CityDistanceDateDifference
Quebec City114 km28 September – 4 November1 day earlier
Sherbrooke116 km27 September – 8 November2 days earlier
Montreal123 km2 October – 13 November3 days later
Burlington213 km4 October – 23 November5 days later
Montpelier231 km17 September – 11 November12 days earlier
Saguenay257 km22 September – 30 October7 days earlier

Where to buy crocus for planting in Trois-Rivières

Planting stock goes into the ground from 29 September to about 8 November; buy it before that. 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).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Trois-Rivières?

In Trois-Rivières, crocus: plant from 29 September to about 8 November. Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

When is the last spring frost in Trois-Rivières?

Last spring frost around 29 April, first autumn frost around 29 October.

Other crops in Trois-Rivières, with their dates