When to Plant Green Beans in Delaware
Published: April 21, 2026
Delaware gardeners in Zone 6a have a 31-week growing season for green bean (March 30 to November 1). The moderate climate supports a full warm-season crop plus an often-productive fall crop. This guide gives exact dates for Delaware based on your local frost calendar.
Green Bean Planting Dates for Delaware
| Start seeds indoors | Year-round |
| Last frost (average) | March 30 |
| Direct sow outdoors | April 6–16 |
| Expect first harvest | May 26 – June 10 |
| Fall crop start | September 6–16 |
| Fall harvest | October 26 |
| First fall frost (average) | November 1 |
Growing Green Beans in Delaware's Climate
Delaware's moderate Zone 6a climate is well-suited to green bean with minimal special accommodation. The standard transplant calendar works as written, and harvest windows line up with what seed packets recommend without adjustment.
Succession planting extends your green bean harvest significantly in Delaware. A second planting 3 to 4 weeks after the first gives you a backup in case of pest pressure and extends the total harvest window into early fall.
Common green bean pests to watch for in Delaware include Mexican Bean Beetle and Aphids. The first line of defense is companion planting: Carrot and Cucumber planted nearby discourage several of these pests by confusing host-plant identification or repelling adults before they can lay eggs. Weekly garden walks in the early morning catch problems when they're still manageable.
Green Bean Garden Calendar for Delaware
| Month | Task | Notes |
|---|---|---|
| January | — | Dormant season |
| February | — | Dormant season |
| March | — | Dormant season |
| April | Direct sow seeds | Sow seeds 1/4–1/2 inch deep, 6 inches apart |
| May ← | First harvest window opens | Green Bean begins producing 50–65 days after transplant |
| June | Peak growth; water 1 inch/week | Monitor for pests daily; stake or support as needed |
| July | Start fall crop seeds | Fall transplants go in 8 weeks before first frost |
| August | — | Dormant season |
| September | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| October | — | Dormant season |
| November | First frost approaches | Harvest remaining green bean; cover plants on frost nights |
| December | — | Dormant season |
Green Bean Growing Tips for Delaware Gardeners
- •Direct sow only — beans do not transplant successfully.
- •Succession plant every 2–3 weeks for continuous harvest throughout the season.
- •Delaware's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Do not over-fertilize with nitrogen — beans fix their own nitrogen from the soil.
Companion Planting for Green Beans in Delaware
In Delaware's moderate climate, planting green bean with Carrot and Cucumber helps deter pests and improve soil. Avoid planting near Onion and Garlic, which inhibit green bean growth through root chemistry or shared pest pressure. See the full green bean companion planting guide for the complete list.
Green Beans Planting Dates by City in Delaware
Top cities in Delaware — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant green bean in Delaware?
In Delaware (Zone 6a), start green bean seeds indoors around Year-round and transplant outdoors around null — 0 weeks after the state's average last frost of March 30.
What is the last frost date in Delaware?
Delaware's average last frost date is March 30 in the state's most common Zone 6a. Frost dates vary by city — higher elevations and northern counties run 1 to 3 weeks later than the state average. See the city list below for city-level frost dates.
Can I grow green bean year-round in Delaware?
Not year-round — Delaware's cold season stops green bean production. The green bean season runs March 30 to November 1, roughly 31 weeks. A fall crop extends harvest into late autumn.
What green bean varieties grow best in Delaware?
For Delaware's Zone 6a, Blue Lake, Provider, and Kentucky Wonder are universally reliable choices.
When do I start green bean seeds indoors in Delaware?
Green bean does not need indoor starting in Delaware — direct sow around April 6–16 once soil reaches 60°F. Indoor starting is not recommended for this crop because green bean transplants poorly.