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When to plant Asparagus

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 Asparagus 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 Mar 25–Apr 8 Feb 24–Mar 10 Jan 13–Jan 27 –
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.

Asparagus goes into the ground four to six weeks before your last frost, Purdue Extension's hardy-crop window (Indiana Vegetable Planting Calendar, HO-186-W) applied to crown planting, since asparagus is grown from crowns rather than started from seed. Virginia Cooperative Extension's zone-specific crown-planting dates (Pub. 426-331) land in the same range.

This page shows no days-to-maturity figure for asparagus, and that is deliberate. University of Missouri Extension (G6201) states it takes three years from crown planting to a real harvest, and Virginia Cooperative Extension is explicit that you should not harvest at all in the planting year. A days-to-maturity number modeled on an annual vegetable would misrepresent what is actually a three-year establishment period, so the field is left blank rather than forced into a shape that does not fit a perennial crop.

No source held for asparagus gives a minimum soil temperature either. In a cold-winter climate, the four-to-six-week-before-frost window means planting into soil that is still cool, which crowns tolerate; in a mild-winter climate the same crown-planting window simply shifts earlier on the calendar, without changing the underlying rule.

Nurseries sell asparagus as dormant crowns, not as seed or as leafy transplants, and a one-year-old crown is the standard planting stock. Buying a crown rather than starting from seed is also the only way to reach a full harvest inside the three-year wait rather than adding a year to it.

Frost hardiness

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

Sourcing notes

Perennial, crown-propagated - PURDUE's hardy window (4-6wk before frost) applied to crown-planting timing, roughly consistent with VCE's zone crown-planting dates. Not an annual days-to-maturity crop: MOEXT states 3 years to first harvest from crown planting, and VCE explicitly warns not to harvest in the planting year - left the days_to_maturity fields blank rather than force a misleading annual figure into them. No min soil temp found.

Related crops

Growing zones for this crop

Nurseries near these locations

Sources