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When to plant Snapdragon

Computed from land-grant Extension planting-window rules (cited below), localized to real ZIP-level median frost dates, not a single national guess. These are national-generic rules by hardiness class; individual state Extension offices layer their own regional adjustment on top (earlier in the Deep South, later in the Upper Midwest). Enter your ZIP for your own dates, or read the four representative locations below.

Planting windows and crop timing here are computed from USDA/NOAA climate data and the university extension sources cited below, not a site visit or soil test. Treat this as a starting point: local conditions vary, and a local nursery or extension office can advise on your exact site. See our full Disclaimer.

Representative timing, by climate band

When to plant Snapdragon in four US climates

Each column is the most nursery-dense location in our directory within that USDA zone band, computed from that location's own real median frost dates, not a made-up example.

Stage Zones 1-5 (cold winters)
Fort Plain, NY 		Zones 6-7 (temperate)
McMinnville, TN 		Zones 8-9 (warm)
Apopka, FL 		Zones 10-13 (hot, frost rare or absent)
Loxahatchee, FL
Start seed indoors Not available Not available Not available –
Direct-sow outside Not available Not available Not available –
Transplant outside Not available Not available Not available –
Fall planting Not available Not available Not available –
Expected harvest Not available Not available Not available –

Zones 10-13 (hot, frost rare or absent) (Loxahatchee, FL): Frost is rare here (about 359 frost-free days a year); most years see little or no hard freeze. This is a hardy crop. In climates like this one, hardy and semi-hardy crops typically go in during the cooler months (fall through late winter), not on a frost-relative schedule.

Snapdragon's frost rating splits three ways. University of Illinois Extension names it directly as a hardy annual example, planted about four weeks before the frost-free date. NC State Extension's Plant Toolbox instead describes it as a short-lived tender perennial grown as an annual, with no explicit frost-hardiness rating attached, closer to a tender or half-hardy read. Clemson Cooperative Extension's own internal classification leaned half-hardy.

This page classifies snapdragon hardy on the strength of Illinois's specific, directly quoted figure, the strongest single statement among the three. But because the other two sources describe the timing differently, and neither states a week count of its own to weigh against Illinois's four weeks, the transplant-timing field on this page is left blank rather than carrying a number only one of three sources backs as firm. Illinois's four-weeks-before figure is real; it just isn't the kind of single, corroborated number this page's computed fields are built to hold.

Clemson's separate "Snapdragons for Fall Blooms" guidance describes using snapdragon as a cool-season, near-perennial planting in zones 8 and 9 with a fall planting date, but gives no specific weeks-before-first-frost figure, so that field is blank as well. No source gives a first-bloom day count or an outdoor minimum soil temperature.

Snapdragon is sold both as seed and as nursery-started flats; the flats are the more common route given the indoor lead time a hardy annual like this typically wants.

Frost hardiness

Hardy. Tolerates hard frost. Can go in the ground before the last frost date.

Sourcing notes

DISAGREEMENT (three-way): University of Illinois Extension explicitly names snapdragon as a hardy annual example, planted "about four weeks before the frost-free date" (used here for transplant_weeks_rel_last_frost = -4). NC State Extension Plant Toolbox instead describes it as a "short-lived tender perennial, grown as annual" with no explicit frost-hardiness rating, closer to a tender/half-hardy read. Clemson HGIC's own Growing Annuals classification (as tabulated internally) leaned half-hardy. Classified hardy here on the strength of Illinois's explicit, directly-quoted statement. Clemson's separate "Snapdragons for Fall Blooms" piece describes using snapdragon as a cool-season/near-perennial in zones 8-9 with fall planting, but gives no specific week-before-first-frost figure, so that field is left blank. No source gave a first-bloom day count or outdoor soil-temp minimum.

Related crops

Growing zones for this crop

Nurseries near these locations

Sources