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When to plant hyacinths in Pittsburgh: 10 October – 22 December

In Pittsburgh, hyacinth: plant from 10 October to about 22 December. For planting stock, the places nearby include Urban Gardner (garden centre, 3 km) and Phelps Nursery USC (garden centre, 11 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 Pittsburgh: soil, season and weather

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

Planting10 October – 22 December
First autumn frost9 November
Coldest nightsJanuary, -5 °C
Soil back at 1 °C in springalready in the first week of January
Daylight11:24 on 10 October
Daylight at the winter solstice9:17

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

Hyacinth in Pittsburgh: 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 Pittsburgh the average daily temperature stays at 10 °C or lower for about 23 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 Pittsburgh, Columbus is 7 days earlier and Cleveland 12 days later.

CityDistanceDateDifference
Cleveland185 km22 October – 23 December12 days later
Erie188 km20 October – 22 December10 days later
Columbus260 km3 October – 25 December7 days earlier
Charleston, West Virginia271 km8 October – end of December2 days earlier
Buffalo288 km11 October – 6 December1 day later
Washington, D.C.305 km17 October – end of December7 days later

Where to buy hyacinth for planting in Pittsburgh

Planting stock goes into the ground from 10 October to about 22 December; buy it before that. Within 15 km of Pittsburgh OpenStreetMap lists 11 garden centres, 4 plant nurseries, 23 markets and 4 farm shops (collected 20 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Pittsburgh?

In Pittsburgh, hyacinth: plant from 10 October to about 22 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 Pittsburgh?

Last spring frost around 19 April, first autumn frost around 9 November.

Other crops in Pittsburgh, with their dates