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

In Detroit, hyacinth: plant from 8 October to about 7 December. For planting stock, the places nearby include Oakland Avenue Farmers Market (farm shop, 7 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).

Hyacinth 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 Crocus.

Hyacinth in Detroit: depth, winter cold, pests and pets

Plant hyacinths 10 cm deep, at least 7.5 cm apart (RHS). In the ground hyacinths are fully hardy, but in containers they can be frost tender in cold winters (RHS); here winter nights average below 0 °C, so wrap the pots or move them to a sheltered spot.

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 12–15 weeks at about 2–10 °C. The winter here gives that in the ground, so the bulbs need no pre-chilling.

Flowers get smaller in the years after planting: for full spikes, replace the bulbs or add a few new ones each autumn (RHS).

If squirrels are a problem, protect the bulbs with wire mesh (RHS). Hyacinths are toxic to dogs, cats and horses: intense vomiting and diarrhoea (ASPCA).

Sources: RHS, Wisconsin Horticulture Extension, ASPCA.

Hyacinth 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 hyacinth 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 hyacinths in Detroit?

In Detroit, hyacinth: 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