Zone 6 · Corn & Legumes Growing Guide

When to Plant Sweet Corn
in Zone 6

The three sisters classic. Needs to be grown in blocks (minimum 4×4) for wind pollination — a single row gives no ears. Sweetness drops fast after picking — eat within 30 minutes of harvest.

Plant outdoors
May 1 – Jun 15
Start indoors
Direct sow
Last Frost
~Apr 1
Days to harvest
65–90 days
Difficulty
Medium
Plant now — Zone 6
Harvest window: Jul – Oct

Planting Calendar

In Zone 6, Sweet Corn should be planted outdoors May 1 – Jun 15, after the average last frost date of approximately Apr 1.

Excellent zone. Multiple succession plantings possible. Supersweet varieties are most popular.

Care Guide

Sunlight
Full sun · 6–8 hrs/day
Watering
High
Spacing
9–12 inches
Soil
Rich, well-draining, fertile
Days to maturity
65–90 days
Soil pH
6.0–6.8
plant tip · Zone 6

Excellent zone. Multiple succession plantings possible. Supersweet varieties are most popular.

Feeding Schedule

How often
twice a season
Feed type
high nitrogen
Key timing
at planting and when knee-high

Heavy feeder — apply nitrogen-rich fertilizer at planting and again when plants reach knee height. Tasseling onwards needs less nitrogen.

Succession Planting

Sow every 2 weeks

Sow every 2 weeks from last frost through early summer. Sweet corn is only good for a few days after harvest — succession means you're picking continuously rather than getting a huge harvest all at once that you can't eat fast enough.

Companion Planting for Sweet Corn

What you plant next to sweet corn makes a real difference — some plants actively help, others compete or attract pests.

Grows well with
  • Beans
  • Squash
  • Cucumbers
  • Sunflowers
Keep away from
  • Tomatoes
  • Brassicas
  • Fennel

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Common questions

In Zone 6, direct sow sweet corn outdoors May 1 – Jun 15 after your last frost date of approximately Apr 1. Excellent zone. Multiple succession plantings possible. Supersweet varieties are most popular.
Zone 6 has an average last spring frost of approximately Apr 1 and a first fall frost around Oct 31. These dates vary by specific location — use your ZIP code in the plant app for precision based on the nearest NOAA weather station.
Good companion crops for sweet corn include Beans, Squash, Cucumbers, Sunflowers. Avoid planting near Tomatoes, Brassicas, Fennel, which can compete for nutrients or attract pests.
Sweet Corn typically takes 65–90 days from transplant or direct sow to harvest in Zone 6. Expected harvest window: Jul – Oct.

Free app · iOS February 2028

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Sweet Corn in other zones
Crop Guides