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When to plant hyacinths in Idaho Falls: 14 September – 14 November

In Idaho Falls, hyacinth: plant from 14 September to about 14 November. For planting stock, the places nearby include Town and Country Gardens (garden centre, 7 km) and R & D Wholesale Nursery (garden centre, 8 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 Idaho Falls: soil, season and weather

Nights then average below 0 °C in November–March; the coldest, January, averages -9.4 °C.

Planting14 September – 14 November
First autumn frost14 October
Coldest nightsJanuary, -9.4 °C
Soil back at 1 °C in spring7 March
Daylight12:36 on 14 September
Daylight at the winter solstice8:57

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

Hyacinth in Idaho Falls: 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 Idaho Falls the average daily temperature stays at 10 °C or lower for about 29 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 Idaho Falls, Helena is 11 days earlier and Boise 13 days later.

CityDistanceDateDifference
Salt Lake City305 km26 September – 23 December12 days later
Boise336 km27 September – end of December13 days later
Helena345 km3 September – 5 November11 days earlier
Billings377 km14 September – 23 Novembersame day
Missoula406 km6 September – 12 November8 days earlier
Elko425 km13 September – 15 November1 day earlier

Where to buy hyacinth for planting in Idaho Falls

Planting stock goes into the ground from 14 September to about 14 November; buy it before that. Within 15 km of Idaho Falls OpenStreetMap lists 4 garden centres, 3 farm-supply shops, 2 plant nurseries, 2 markets and 1 farm shop (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant hyacinths in Idaho Falls?

In Idaho Falls, hyacinth: plant from 14 September to about 14 November. 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 Idaho Falls?

Last spring frost around 11 May, first autumn frost around 14 October.

Other crops in Idaho Falls, with their dates