Zone 4 · Root Vegetables Growing Guide

When to Plant Potato
in Zone 4

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
Apr 25 – May 20
Start indoors
Direct sow
Last Frost
~May 1
Days to harvest
70–120 days
Difficulty
Medium
Plant now — Zone 4
Harvest window: Aug – Oct

Planting Calendar

In Zone 4, Potato should be planted outdoors Apr 25 – May 20, after the average last frost date of approximately May 1.

Plant early varieties mid-April to late May. Chit seed potatoes (sprout in light) for 2 weeks first.

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 4

Plant early varieties mid-April to late May. Chit seed potatoes (sprout in light) for 2 weeks first.

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 4, direct sow potato outdoors Apr 25 – May 20 after your last frost date of approximately May 1. Plant early varieties mid-April to late May. Chit seed potatoes (sprout in light) for 2 weeks first.
Zone 4 has an average last spring frost of approximately May 1 and a first fall frost around Oct 1. 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 4. Expected harvest window: Aug – Oct.

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