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When to plant hyacinths in Indianapolis: 7 October – 23 December

In Indianapolis, hyacinth: plant from 7 October to about 23 December. For planting stock, the places nearby include Grounded Plant + Floral Co. (garden centre, 1 km) and Botanical Bar (garden centre, 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).

Hyacinth in Indianapolis: soil, season and weather

Nights then average below 0 °C in December–February; the coldest, January, averages -5 °C.

Planting7 October – 23 December
First autumn frost6 November
Coldest nightsJanuary, -5 °C
Soil back at 1 °C in springalready in the first week of January
Daylight11:33 on 7 October
Daylight at the winter solstice9:21

The same dates in Indianapolis hold for Garlic, Tulip, Daffodil and Crocus.

Hyacinth in Indianapolis: 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 Indianapolis the average daily temperature stays at 10 °C or lower for about 22 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 Indianapolis, Fort Wayne is 4 days earlier and Louisville 5 days later.

CityDistanceDateDifference
Cincinnati159 km10 October – end of December3 days later
Fort Wayne169 km3 October – 10 December4 days earlier
Louisville173 km12 October – end of December5 days later
Frankfort207 km4 October – end of December3 days earlier
Evansville233 km11 October – end of December4 days later
Lexington246 km8 October – end of December1 day later

Where to buy hyacinth for planting in Indianapolis

Planting stock goes into the ground from 7 October to about 23 December; buy it before that. Within 15 km of Indianapolis OpenStreetMap lists 9 garden centres, 1 farm-supply shop, 2 plant nurseries and 4 markets (collected 20 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Indianapolis?

In Indianapolis, hyacinth: plant from 7 October to about 23 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 Indianapolis?

Last spring frost around 14 April, first autumn frost around 6 November.

Other crops in Indianapolis, with their dates