How to grow asparagus
Asparagus officinalis · Asparagaceae · Vegetable
When to plant asparagus: the short answer
Plant out about 2 weeks before it. Seeds germinate in soil from 60 to 85°F, fastest near 75°F.
Zone 5: plant out Apr 9 – Apr 26. Zone 7: plant out Mar 15 – Apr 1. Zone 9: plant out Jan 30 – Feb 16. See every zone.
Asparagus is a cool-season vegetable in the Asparagaceae family, usually started indoors and set out as transplants. It wants full sun (six or more hours of direct light) and steady, even moisture. From sowing to first pick is about 730–1095 days. It is one of the toughest crops here, standing through hard frost and often improving for it.
Grower’s note: A 15-20 year perennial - prepare the bed thoroughly. Plant one-year-old crowns in a wide trench in early spring. Do not harvest at all the first year and only for two to three weeks the second; let the ferns grow all summer to feed the crowns.
Sowing
Sow about 6″ deep, into soil between 60–85°F — germination is quickest near 75°F. It is slow and often erratic to germinate (21–53 days).
Spacing & layout
Give each plant about 18″ along the row with roughly 48″ between rows. On a square-foot grid that is one plant per 4 square feet. Allow at least 24″ of loose, workable soil for the roots. It needs more root room than most containers give and does best in the ground.
Fitting it to your season
Asparagus is a perennial: you plant it once and it comes back and crops for years, so it does not fit the annual sow-and-harvest cycle. Give it a permanent, well-prepared spot out of the way of yearly digging. It takes one to three seasons to reach a full harvest — take little or nothing the first year while the plant establishes.
Quick facts
Growth stages: how long asparagus takes to grow
From seed to first harvest takes roughly 108-160 weeks: about 4 weeks as a seedling indoors, then 730-1095 days in the garden. It is a perennial, so once established it comes back and crops year after year.
When to plant asparagus
When to plant asparagus by USDA zone
Dates worked out from each zone’s typical frost dates for 2026. Find your zone on the zone map, or pick your state below for dates from its own frost dates. Zones 11 and above are frost-free, so timing there depends on heat and rain instead.
| Zone | Last / first frost | Start indoors | Sow or plant out |
|---|---|---|---|
| Zone 3 | May 15 / Sep 15 | - | Apr 24 – May 11 |
| Zone 4 | May 10 / Sep 25 | - | Apr 19 – May 6 |
| Zone 5 | Apr 30 / Oct 5 | - | Apr 9 – Apr 26 |
| Zone 6 | Apr 15 / Oct 15 | - | Mar 25 – Apr 11 |
| Zone 7 | Apr 5 / Oct 25 | - | Mar 15 – Apr 1 |
| Zone 8 | Mar 20 / Nov 5 | - | Feb 27 – Mar 16 |
| Zone 9 | Feb 20 / Nov 30 | - | Jan 30 – Feb 16 |
| Zone 10 | Jan 30 / Dec 15 | - | Jan 9 – Jan 26 |
Companions
Tomato, Parsley, Basil
Onion, Garlic, Potato
Common problems
Pests: asparagus beetle, cutworm.
Diseases & disorders: asparagus rust, fusarium crown rot, purple spot.
Questions gardeners ask
When should I plant asparagus?
Plant out about 2 weeks before it. Seeds germinate in soil from 60 to 85°F. The table on this page gives dates for each USDA zone, and the planting calendar gives dates for your own state or ZIP code.
How long does asparagus take to grow?
About 730-1095 days from transplanting to the first harvest, or roughly 108-160 weeks from sowing the seed indoors. Seeds germinate in 21-53 days.
How much sun does asparagus need?
It needs at least six to eight hours of direct sun a day.
What soil pH does asparagus need?
A soil pH between 6.5 and 8.0. It tolerates neutral to slightly alkaline soil better than most vegetables. Test before adding lime or sulfur - see the soil pH and testing guide.
How far apart should I plant asparagus?
Space plants about 18 inches apart in rows 48 inches apart, or one plant per 4 square feet in a square-foot bed. Sow seeds about 6 inches deep.
Can I grow asparagus in a container?
It is not well suited to containers - it needs more root room and space than a pot gives, so grow it in a bed.
Figures are typical home-garden ranges from Cooperative Extension planting guides, cross-checked against multiple state sources. Your variety and conditions will vary.