Zone 4 · Squash Growing Guide

When to Plant Yellow Summer Squash
in Zone 4

Equally prolific as zucchini. Harvest at 6–8 inches — left longer, they become tough and seedy and the plant slows production. Two plants is plenty for most families.

Plant outdoors
May 20 – Jun 10
Start indoors
May 1 – May 10
Last Frost
~May 1
Days to harvest
45–55 days
Difficulty
Easy
Wrong season — Zone 4
Harvest window: Jul – Sep

Planting Calendar

In Zone 4, Yellow Summer Squash should be planted outdoors May 20 – Jun 10, after the average last frost date of approximately May 1. Start seeds indoors around May 1 – May 10 for a head start.

Good producer. Plant in hills with compost. Keep picking to keep plants producing.

Care Guide

Sunlight
Full sun · 6–8 hrs/day
Watering
High
Spacing
24–36 inches
Soil
Rich, well-draining, compost-amended
Days to maturity
45–55 days
Soil pH
6.0–7.5
plant tip · Zone 4

Good producer. Plant in hills with compost. Keep picking to keep plants producing.

Feeding Schedule

How often
every 3 weeks
Feed type
balanced (10-10-10)
Key timing
at planting and monthly

Same as zucchini — rich soil at planting reduces need for heavy feeding during the season.

Succession Planting

Sow every 4 weeks

Sow a second batch 4 weeks after the first. Same as zucchini — fresh plants produce more reliably than exhausted ones.

Companion Planting for Yellow Summer Squash

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

Grows well with
  • Beans
  • Corn
  • Nasturtiums
  • Marigolds
Keep away from
  • Potatoes
  • Brassicas
  • Fennel

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Common questions

In Zone 4, start yellow summer squash seeds indoors around May 1 – May 10, then transplant outdoors May 20 – Jun 10 after your last frost around May 1. Good producer. Plant in hills with compost. Keep picking to keep plants producing.
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 yellow summer squash include Beans, Corn, Nasturtiums, Marigolds. Avoid planting near Potatoes, Brassicas, Fennel, which can compete for nutrients or attract pests.
Yellow Summer Squash typically takes 45–55 days from transplant or direct sow to harvest in Zone 4. Expected harvest window: Jul – Sep.

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Yellow Summer Squash in other zones
Crop Guides