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When to plant hyacinths in Rennes: by 29 October

In Rennes, hyacinth: plant by 29 October. The winter here is too mild for our late-planting rule, so we give no later limit. For planting stock, the places nearby include Ferme Bougerie (farm shop, 6 km) and Ferme de la Touche du Val (farm shop, 11 km); addresses and opening hours are below.

Hyacinth in Rennes: soil, season and weather

No month averages below 0 °C at night; the coldest nights, in January, average 2.9 °C.

Plantingby 29 October
First autumn frost28 November
Coldest nightsJanuary, 2.9 °C
Soil back at 1 °C in springalready in the first week of January
Daylight10:08 on 29 October
Daylight at the winter solstice8:21

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

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

Plant hyacinths 10 cm deep, at least 7.5 cm apart (RHS).

In Rennes the average daily temperature stays at 10 °C or lower for about 21 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 Rennes, Le Mans is 4 days earlier and Le Havre 14 days later.

CityDistanceDateDifference
Nantes99 kmby 30 October1 day later
Angers110 kmby 28 October1 day earlier
Le Mans140 km25 October – end of December4 days earlier
Caen154 kmby 5 November7 days later
Quimper180 kmby 9 November11 days later
Le Havre202 kmby 12 November14 days later

Where to buy hyacinth for planting in Rennes

Planting stock goes into the ground by 29 October; buy it before that. Within 15 km of Rennes OpenStreetMap lists 21 garden centres, 5 farm-supply shops, 3 plant nurseries, 41 markets and 19 farm shops (collected 20 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Rennes?

In Rennes, hyacinth: plant by 29 October. The winter here is too mild for our late-planting rule, so we give no later limit.

When is the last spring frost in Rennes?

Last spring frost around 12 March, first autumn frost around 28 November.

Other crops in Rennes, with their dates