Rainbow Corn

Family: Poaceae Grain Vegetable

Planting Schedule

Provide your location or planting zone to unlock dates and add Rainbow Corn to a garden.

Sunlit kernels in a living spectrum—creamy gold, rosy blush, and cool blue-green—glow along each Rainbow Corn ear with a satin sheen that feels almost too beautiful to touch.

At maturity, the cobs are medium to long with tightly packed rows, offering a tender, sweet corn flavor that shines in fresh displays and becomes especially memorable when roasted or grilled for caramelized depth. Grow it for show-stopping color in the garden and for versatile use in salads, salsas, and vibrant pickling projects—each harvest a small bouquet of edible color.

Light: Full SunMaturity: 75 DaysHabit: Upright

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Rainbow Corn Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	Protected Environment Only
Zone 2a	Direct Sow	May 25th	Aug 8th – Aug 29th
Zone 2b	Direct Sow	May 15th	Jul 29th – Aug 25th
Zone 3a	Direct Sow	May 15th	Jul 29th – Sep 1st
Zone 3b	Direct Sow	May 19th	Aug 2nd – Sep 21st
Zone 4a	Direct Sow	May 15th	Jul 29th – Sep 24th
Zone 4b	Direct Sow	May 13th	Jul 27th – Sep 27th
Zone 5a	Direct Sow	May 8th	Jul 22nd – Sep 30th
Zone 5b	Direct Sow	May 4th	Jul 18th – Oct 5th
Zone 6a	Direct Sow	May 1st	Jul 15th – Oct 10th
Zone 6b	Direct Sow	Apr 25th	Jul 9th – Oct 16th
Zone 7a	Direct Sow	Apr 20th	Jul 4th – Oct 20th
Zone 7b	Direct Sow	Apr 10th	Jun 24th – Oct 28th
Zone 8a	Direct Sow	Apr 1st	Jun 15th – Nov 5th
Zone 8b	Direct Sow	Mar 23rd	Jun 6th – Nov 12th
Zone 9a	Direct Sow	Mar 6th	May 20th – Nov 26th
Zone 9b	Direct Sow	Feb 9th	Apr 25th – Dec 9th
Zone 10a	—	Oct 1st	Dec 15th – Feb 28th
Zone 10b	—	Oct 1st	Dec 15th – Feb 28th
Zone 11a	—	Oct 1st	Dec 15th – Feb 28th
Zone 11b	—	Oct 1st	Dec 15th – Feb 28th
Zone 12a	—	Oct 1st	Dec 15th – Feb 28th
Zone 12b	—	Oct 1st	Dec 15th – Feb 28th
Zone 13a	—	Oct 1st	Dec 15th – Feb 28th
Zone 13b	—	Oct 1st	Dec 15th – Feb 28th

Crop Details

Trait	Value
Days to Maturity	75
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	60
Min Soil Temp (°F)	55
Min Night Temp (°F)	50
Harden Off (days)	Not Required

Culinary Notes

Chef's Note

This is saccharata-style sweet corn—because the kernels stay tender and creamy, it carries dressings without going starchy and dull. Roast/grill until you get real browning on the ridges, then finish with lime and dairy to turn the sweetness into something caramel-cool, not candy.

Best Uses

grill-roast on high heat for caramelized blistering, then slice for bowls
shuck-and-heat fresh kernels into smoky salads with lime
blend kernels into chunky salsas with cilantro and chile
quick-pickle for poppy, sweet-tang relish and tacos

Flavor Profile

tender, sweet corn kernels creamy juiciness with a buttery finish roasty, caramelized nuttiness when charred snappy bite from tightly packed rows

Kitchen Pairings

lime cilantro chile (jalapeño or serrano) smoked paprika or cumin cotija or queso fresco butter or crema

Frequently Asked Questions

What pests or diseases commonly hit sweet corn (Zea mays var. saccharata), and what can I do right away?

Corn earworm and fall armyworm are common and usually show up as holes in ear tips with frass. Check ears every 2–3 days once silks emerge and remove heavily infested ears early; for protection, use a Bt corn spray when silks are actively growing (follow the label) and keep weeds down around the bed. Watch for fungal leaf blights and rust; if you see spreading leaf spotting, improve airflow by thinning to the recommended spacing and avoid overhead watering.

How often should I water rainbow sweet corn during the main growing phase (tasseling to ear fill)?

From about tassel emergence through ear fill, keep soil consistently moist—typically 1–1.5 inches (2.5–3.8 cm) per week, split into 2–3 waterings to prevent drying between. Water deeply so moisture reaches the rooting zone, and stop light “sprinkling” that only wets the surface. If soil dries enough for leaves to wilt in the afternoon, water immediately to protect ear development.

How can I tell when rainbow sweet corn is ready to harvest?

Harvest when silks turn brown and dry, and kernels release a milky juice when you press them—this is the best sweet-corn indicator. Each ear is usually ready about 18–22 days after the first silks appear, but check the earliest-developed ears first. For peak sweetness, plan to harvest the same day you’ll eat or refrigerate immediately after picking.