Zone 3 · Root Vegetables Growing Guide

When to Plant Potato
in Zone 3

Incredibly productive — a 10-foot row can yield 25 lbs of potatoes. Plant certified seed potatoes. Hilling soil around stems as they grow is the key technique.

Plant outdoors
May 10 – Jun 1
Start indoors
Direct sow
Last Frost
~May 15
Days to harvest
70–120 days
Difficulty
Medium
Wrong season — Zone 3
Harvest window: Aug – Sep

Planting Calendar

In Zone 3, Potato should be planted outdoors May 10 – Jun 1, after the average last frost date of approximately May 15.

Plant as soon as soil is workable and threat of hard frost passes. Early varieties essential (70-day). Harvest before first fall frost.

Care Guide

Sunlight
Full sun · 6–8 hrs/day
Watering
Regular
Spacing
12–15 inches
Soil
Loose, well-draining, acidic
Days to maturity
70–120 days
Soil pH
4.8–6.0
plant tip · Zone 3

Plant as soon as soil is workable and threat of hard frost passes. Early varieties essential (70-day). Harvest before first fall frost.

Feeding Schedule

How often
twice a season
Feed type
balanced then high potassium
Key timing
at planting and when flowering

Feed with balanced fertilizer at planting. Apply high-potassium feed when plants flower to improve tuber development.

Companion Planting for Potato

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

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

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Common questions

In Zone 3, direct sow potato outdoors May 10 – Jun 1 after your last frost date of approximately May 15. Plant as soon as soil is workable and threat of hard frost passes. Early varieties essential (70-day). Harvest before first fall frost.
Zone 3 has an average last spring frost of approximately May 15 and a first fall frost around Sep 15. 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 potato include Beans, Brassicas, Corn, Marigolds. Avoid planting near Tomatoes, Squash, Cucumbers, Fennel, which can compete for nutrients or attract pests.
Potato typically takes 70–120 days from transplant or direct sow to harvest in Zone 3. Expected harvest window: Aug – Sep.

Free app · iOS February 2028

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Potato in other zones
Crop Guides