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Hyacinth planting zones

Hyacinth (Hyacinthus orientalis) is a perennial. By the type table below, at least one type lives through winter in the ground in 4a–9a; outside those zones, none of the types on this page is rated. Below the types are the dates its year turns on: each zone’s median last spring freeze and first fall freeze, from NOAA records.

Published October 27, 2026 · Cite this page

The types

Which hyacinth to grow

Type Hardy in the ground Notes
Dutch (garden) hyacinth Hyacinthus orientalis hybrids (e.g. ‘Blue Jacket’, ‘Woodstock’) 4a to 8b, then too little winter NC State rates it zones 4 to 8, and says flowers grow smaller and wider spaced each year it is left in the ground.
Roman hyacinth Hyacinthus orientalis var. albulus 6a to 9a, then too hot or humid Smaller flowers than the Dutch hyacinth, but more persistent (Clemson).

Zone ranges are a judgement: horticultural convention set beside what the sources below say, not a measurement. “Too little winter” means the type needs winter chill the warm zones do not give it. In the next table the freeze dates are measured, and the count of hardy types comes from these judged ranges.

Zone by zone

Where hyacinth lives through winter, and when the freezes fall

Each date is the median across every NOAA station the zone’s ZIP codes cite, 1991–2020 normals. The middle half of those stations falls within the range shown beside it.

Zone Types hardy in the ground Last spring freeze First fall freeze
3a 0 of 2 only 10 stations with comparable freeze dates — too few to publish a date
3b 0 of 2 May 18 · middle half May 15 – May 25 September 23 · middle half September 17 – September 26
4a 1 of 2 May 15 · middle half May 10 – May 21 September 27 · middle half September 22 – September 30
4b 1 of 2 May 11 · middle half May 5 – May 23 September 30 · middle half September 23 – October 3
5a 1 of 2 May 9 · middle half May 1 – May 20 October 2 · middle half September 26 – October 7
5b 1 of 2 May 4 · middle half April 27 – May 15 October 8 · middle half October 1 – October 14
6a 2 of 2 May 1 · middle half April 24 – May 9 October 14 · middle half October 5 – October 20
6b 2 of 2 April 25 · middle half April 17 – May 3 October 20 · middle half October 11 – October 24
7a 2 of 2 April 19 · middle half April 11 – April 27 October 23 · middle half October 17 – October 28
7b 2 of 2 April 8 · middle half April 3 – April 16 October 30 · middle half October 25 – November 3
8a 2 of 2 March 30 · middle half March 25 – April 5 November 5 · middle half November 1 – November 10
8b 2 of 2 March 20 · middle half March 13 – March 29 November 12 · middle half November 7 – November 18
9a 1 of 2 March 5 · middle half February 24 – March 15 November 24 · middle half November 18 – December 2
9b 0 of 2 February 12 · middle half January 30 – February 25 December 8 · middle half December 1 – December 17
10a 0 of 2 107 of 190 stations here record no ordinary freeze, so there is no freeze date to count from
10b 0 of 2 70 of 79 stations here record no ordinary freeze, so there is no freeze date to count from
11a 0 of 2 34 of 34 stations here record no ordinary freeze, so there is no freeze date to count from
11b 0 of 2 12 of 12 stations here record no ordinary freeze, so there is no freeze date to count from

“Types hardy in the ground” is a judgement, from the type table above. The freeze dates are measured.

A zone does not tell you your own dates. Inside a single zone the median last spring freeze still varies by 34 days from station to station, so the box below gives the dates of the NOAA station nearest your ZIP code.

Your ZIP code

Your ZIP, your answer

Enter your ZIP code to see your USDA zone, how many of the 2 types on this page live through that zone’s winter and when its freezes fall, read from the table on this page, and the freeze dates of the NOAA station nearest you.

Works for all 40,502 US ZIP codes. Freeze dates need a NOAA station within 100 km; where there is none, the page says so rather than estimating one. Your ZIP code stays in your browser: the page downloads the file of ZIP codes that share its first three digits and looks yours up there. It is not stored or tracked.

Your answer appears here.

Full details for any ZIP code: ZIP code zone finder.

Hyacinths and your winter

NC State Extension’s plant toolbox rates hyacinth zones 4 to 8. It says each bulb usually produces one flower spike in mid-spring, and that grown as a perennial outdoors the flowers get smaller and more widely spaced each year. Clemson Cooperative Extension says hyacinths can be left in the ground to multiply in South Carolina’s upper Piedmont, but flower size declines; for large flowers every year, dig the bulbs after the leaves wither and store them to replant, or buy new bulbs each fall. Roman hyacinths have smaller flowers but are more persistent, Clemson says.

Planting hyacinths

Clemson plants hyacinths in full sun, 4 to 6 inches deep and 3 to 6 inches apart, and waits until the soil has cooled: late October or November in the upper Piedmont, late December or early January on the coast. LSU AgCenter plants them about 5 inches deep and 3 or 4 inches apart. NC State grows them in organically rich, well-drained soil in full sun to part shade, and says to keep the soil moist right after planting to encourage roots.

NC State and University of Wisconsin–Madison Extension both say to wear gloves when planting hyacinth bulbs, because some people get skin irritation from handling them.

The zone table on this page gives the median first fall freeze for every half zone. University of Minnesota Extension plants hardy bulbs so they root before the ground freezes, and University of Illinois Extension says any time before the ground freezes will do.

Supplies

Supplies the sources mention

Each link opens an Amazon search for a plain kind of product, not one we picked. We have not tested these, and we do not rank them.

As an Amazon Associate I earn from qualifying purchases. It costs you nothing extra and changes nothing on this page: the dates are NOAA’s and the advice is the extension services’. Affiliate disclosure

Chilling hyacinths in the South

Clemson says hyacinths need six to eight weeks of refrigeration to bloom in coastal South Carolina, away from fruit, whose ethylene gas can prevent blooming. LSU AgCenter, writing for Louisiana, refrigerates hyacinths at least six to eight weeks and plants them in late December or early January. Texas A&M AgriLife in Bexar County (the San Antonio area) chills them in the lower part of the refrigerator until mid or late December, not in air-tight bags. UC Master Gardeners in Sacramento County chill hyacinths at least 6 weeks in a paper bag in the crisper.

After flowering

NC State removes spent flower spikes promptly so the plants do not spend energy making seed, and tapers off watering after bloom as the bulbs head into dormancy. It says hyacinths tolerate drought but need moist soil right after planting. Leave the leaves until they wither, Clemson says, before digging the bulbs.

Hyacinths indoors

NC State says hyacinths are commonly grown in containers, especially forced for indoor winter bloom, but that potted florist hyacinths are unsuited to long-term growth in a home. Iowa State University Extension and Outreach grows pre-chilled hyacinths in hourglass-shaped forcing vases, with the water touching the roots but never the base of the bulb, which would rot; it discards hyacinths forced in glasses afterward. The full method is in the forcing guide under Seasonal jobs on this page.

Handling and toxicity

NC State’s plant toolbox rates hyacinth medium in toxicity, says all parts are mildly toxic if eaten, with the most toxin in the bulbs, and that the sap can cause skin irritation.

Common mistakes

We found no Florida, Alabama or Mississippi source for hyacinths that we could read; Texas A&M AgriLife’s Bexar County and LSU AgCenter’s advice cover chilling and planting only. Other Southern advice on this page is Clemson’s.

Questions

How deep do you plant hyacinth bulbs?
Clemson plants them 4 to 6 inches deep and 3 to 6 inches apart; LSU AgCenter about 5 inches deep and 3 or 4 inches apart.
Do hyacinths come back every year?
They can, with smaller flowers. NC State says flowers become smaller and more widely spaced each year outdoors, and Clemson says they can multiply in the upper Piedmont but flower size declines.
How long do hyacinth bulbs need in the refrigerator?
Clemson and LSU AgCenter refrigerate hyacinths six to eight weeks where winters are mild; UC Master Gardeners in Sacramento County at least 6 weeks.
Why wear gloves to plant hyacinths?
NC State and Wisconsin say some people develop skin irritation from handling the bulbs.
Are hyacinths toxic?
NC State’s plant toolbox says all parts are mildly toxic if eaten, with the most toxin in the bulbs, and rates the plant medium in toxicity.

Sources

Freeze dates on this page are NOAA 1991–2020 Climate Normals, for every station the ZIP codes in each zone cite. Zones are the USDA Plant Hardiness Zone Map, 2023. The type table is a judgement, as labelled above. Growing advice is quoted from the extension publications below, each written for its own area.

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Published October 27, 2026

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