Nebraska · zones 4b–5b
When to plant broccoli in Nebraska.
Sow or transplant between Mar 7 to Apr 4 in a typical year, keyed to Nebraska's median last frost around Apr 28. A second, fall sowing fits Jun 22 to Aug 1. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Broccoli dates for a typical Nebraska season.
1 · Start indoors
Jan 24 to Feb 21
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Mar 7 to Apr 4
Keyed to the ~Apr 28 last frost. Sow 0.5" deep, 18" apart.
Fall round
Jun 22 to Aug 1
Counted back from the ~Oct 6 first frost.
Harvest
~60 days later
~1.2 lb per plant over ~3 weeks.
Nebraska spans more than one climate: Zone 5 is the most common zone, but the state runs 4b to 5b. That's why the planner works from your ZIP code's frost dates, not your zone: mountain and coastal gardens in the same state can be three weeks apart.
Nebraska growing notes
Broccoli here gets one head per plant, and Nebraska's spring gives that head far less room to work with than the fall window sitting right behind it.
One Head, One Shot, and a Spring That Rushes It
A broccoli plant puts almost everything into a single central head, and once that head is cut, the plant's main job for the year is done, unlike a leafy crop that keeps producing new growth all season. That raises the stakes on the run-up to harvest: a transplant needs about 60 days of decent weather to size a head up properly, and Nebraska's spring does not always cooperate. Heat and dry wind arriving as the head fills out keeps it from tightening up, leaving it loose and uneven instead of dense. A separate problem, buttoning, traces back earlier: a late cold snap on a young transplant, transplant shock, or a transplant left too long in its pot checks the plant's growth early, and it responds by throwing a small head instead of a full one, sometimes no bigger than a golf ball, with no second attempt behind it.
A tight head is thousands of unopened flower buds packed close together, and the first sign of trouble is small yellow petals showing between them, a sign the plant has switched to flowering. Once that shows anywhere on the head, cut it that day, since flavor turns sharp and texture turns loose within days. A hailstorm during that same stretch adds a second risk: a bruised, discolored head is still fine to eat if cut and used soon after, but it will not hold in the row the way an undamaged one would.
Where the Season's Length Points a Fall Crop
Set against a season running close to 161 days, broccoli's 60 days from transplant leaves real room on both ends, and the fall planting is usually the one that uses it best. A transplant set out in mid to late summer heads up as days shorten and cool rather than warm, so the same plant that would rush and button under a hot, dry spring wind instead fills its head out steadily, without the rush a spring head faces.
Cold-hardy varieties fit the fall window best. Waltham 29, an old, widely grown variety bred specifically to hold up under cold, can sit through a light frost or two without giving up the way a more heat-adapted variety would. That tolerance matters more in a state running zones as cold as 4b in its coldest pockets than somewhere the season simply ends before cold becomes a factor.
What to Check on the Transplant, the Leaf, and the Head
Flea beetles do the most damage right after transplanting, when a plant is smallest and least able to shrug off tiny holes chewed into its leaves; checking new transplants every few days catches a beetle problem while the plant can still outgrow it. Black rot spreads fastest through a wet planting, carried on tools, hands, or splashing water from leaf to leaf, so working a dew-soaked block spreads it to every plant in the row. Once inside a leaf, the bacterium travels the veins toward the stem, where a bad infection can reach below the head instead of stopping at a leaf that gets pulled and discarded. Picking in the dry part of the afternoon rather than a damp morning keeps it from moving down the row.
Cabbage root maggot targets the same young stage from underground, tunneling into the roots of a transplant still settling in. A plant that looks stressed for no visible reason is worth testing with a gentle tug at the base; one that lifts with almost no resistance has lost the roots that should be anchoring it. Cabbage worms and loopers hide well inside a forming head, blending into the same green as the buds around them, and the surest check comes after harvest: soak a cut head in salted water for a few minutes and any hidden caterpillars lose their grip and float free. Aphids cluster in the tight space between the buds, where a spray struggles to reach.
In Nebraska: watch for
The pests that find broccoli here.
A middle-length season, about 161 frost-free days, means broccoli overlaps cabbage worms & loopers for a stretch each summer. Check plants every week or two and treat early.
Green caterpillars chewing ragged holes; green droppings.
Organic fix: Handpick, cover with netting, spray Bt.
Gray-green clusters tucked into the leaf folds.
Organic fix: Blast with water, then insecticidal soap.
Tiny holes peppering the young leaves.
Organic fix: Row cover from day one; diatomaceous earth.
Black rot
Yellow V-shaped wedges cutting in from the leaf edge, veins blackening inside.
Organic fix: Pull infected plants, water at the base, keep brassicas out of that bed 3 years.
Seedlings wilt, yellow and stall for no reason; white maggots tunnel the roots.
Organic fix: Row cover before the flies are up, when yellow rocket blooms; rotate the bed.
Your season math: Nebraska gives broccoli about 161 frost-free days, and it needs roughly 60 days to a first harvest. It's a one-planting crop, so time that single sowing well.
Planting broccoli in Nebraska: questions
When should I plant broccoli in Nebraska?+
In a typical Nebraska year, sow broccoli or set out transplants between Mar 7 to Apr 4, keyed to the state's median last frost around Apr 28. There's also a fall window: Jun 22 to Aug 1. Your exact dates shift with your ZIP code and microclimate.
When do I start broccoli seeds indoors in Nebraska?+
Start seeds inside about 6 weeks before set-out: roughly Jan 24 to Feb 21 for a typical Nebraska season.
What USDA zone is Nebraska?+
Nebraska spans zones 4b–5b, mostly zone 5. But frost dates, not zones, set planting time. The free planner uses your ZIP code's actual frost dates.
How many broccoli plants do I need?+
Depends who you're feeding. The crop page has exact counts per household size, or the free planner does the math for your family in about 60 seconds.