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When to plant crocuses in Detroit: 8 October – 7 December

In Detroit, crocus: plant from 8 October to about 7 December. For planting stock, the places nearby include Key Foods (farm supply, 2 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 Detroit: soil, season and weather

Nights then average below 0 °C in December–March; the coldest, January, averages -5.8 °C.

Planting8 October – 7 December
First autumn frost7 November
Coldest nightsJanuary, -5.8 °C
Soil back at 1 °C in spring15 January
Daylight11:27 on 8 October
Daylight at the winter solstice9:05

The same dates in Detroit hold for Garlic, Tulip, Daffodil and Hyacinth.

Crocus in Detroit: 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 Detroit the average daily temperature stays at 10 °C or lower for about 25 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 Detroit, Kitchener is 12 days earlier and Cleveland 14 days later.

CityDistanceDateDifference
Ann Arbor58 km6 October – 30 November2 days earlier
Lansing131 km3 October – 29 November5 days earlier
Cleveland145 km22 October – 23 December14 days later
Fort Wayne222 km3 October – 10 December5 days earlier
Grand Rapids225 km4 October – 29 November4 days earlier
Kitchener240 km26 September – 21 November12 days earlier

Where to buy crocus for planting in Detroit

Planting stock goes into the ground from 8 October to about 7 December; buy it before that. Within 15 km of Detroit OpenStreetMap lists 3 garden centres, 1 farm-supply shop, 11 plant nurseries, 11 markets and 3 farm shops (collected 7 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Detroit?

In Detroit, crocus: plant from 8 October to about 7 December. 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 Detroit?

Last spring frost around 24 April, first autumn frost around 7 November.

Other crops in Detroit, with their dates