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When to plant hyacinths in Klagenfurt: 25 August – 30 October

In Klagenfurt, hyacinth: plant from 25 August to about 30 October. For planting stock, the places nearby include Hofladen (farm shop, 3 km) and Waldhauser's (farm shop, 4 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 Klagenfurt: soil, season and weather

Nights then average below 0 °C in November–April; the coldest, January, averages -9.1 °C.

Planting25 August – 30 October
First autumn frost24 September
Coldest nightsJanuary, -9.1 °C
Soil back at 1 °C in spring3 April
Daylight13:44 on 25 August
Daylight at the winter solstice8:34

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

Hyacinth in Klagenfurt: 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 Klagenfurt the average daily temperature stays at 10 °C or lower for about 38 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

All the nearest cities on our list plant hyacinth later than Klagenfurt; the closest date is in Salzburg, 37 days later.

CityDistanceDateDifference
Graz99 km11 October – end of December47 days later
Udine102 km23 October – end of December59 days later
Trieste115 km29 October – end of December65 days later
Zagreb157 km23 October – end of December59 days later
Salzburg163 km1 October – end of December37 days later
Linz188 km13 October – end of December49 days later

Where to buy hyacinth for planting in Klagenfurt

Planting stock goes into the ground from 25 August to about 30 October; buy it before that. Within 15 km of Klagenfurt OpenStreetMap lists 11 garden centres, 1 plant nursery, 2 markets and 7 farm shops (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Klagenfurt?

In Klagenfurt, hyacinth: plant from 25 August to about 30 October. 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 Klagenfurt?

Last spring frost around 21 May, first autumn frost around 24 September.

Other crops in Klagenfurt, with their dates