When to plant hyacinths in Jaca: 1 October – end of December

In Jaca, hyacinth: plant from 1 October to the end of 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.

The average daily temperature here stays above 0 °C all winter, and at least three months average 7 °C or less: our rule of thumb for the winter cold spring bulbs need. Sources: Iowa State University Extension, Wisconsin Horticulture Extension, UNH Extension, RHS.

Hyacinth in Jaca: soil, season and weather

Nights then average below 0 °C in December–March; the coldest, January, averages -3.3 °C.

Planting	1 October – end of December
First autumn frost	31 October
Coldest nights	January, -3.3 °C
Soil back at 1 °C in spring	already in the first week of January
Daylight	11:47 on 1 October
Daylight at the winter solstice	9:03

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

Hyacinth in Jaca: 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 Jaca the average daily temperature stays at 10 °C or lower for about 28 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 Jaca; the closest date is in Huesca, 26 days later.

City	Distance	Date	Difference
Huesca	47 km	by 27 October	26 days later
Pau	86 km	by 4 November	34 days later
Pamplona	94 km	31 October – end of December	30 days later
Tudela	102 km	by 7 November	37 days later
Zaragoza	104 km	by 20 November	50 days later
Bayonne	129 km	by 17 November	47 days later

Where to buy hyacinth for planting in Jaca

Planting stock goes into the ground from 1 October to the end of December; buy it before that. Within 15 km of Jaca OpenStreetMap lists 1 farm shop (collected 28 October 2026).

Comercial Agraria El Llano — farm shop
2 km

Questions