Zone 10 · Squash Growing Guide

When to Plant Yellow Summer Squash
in Zone 10

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
Feb 1 – Mar 15
Start indoors
Direct sow
Last Frost
~Jan 15
Days to harvest
45–55 days
Difficulty
Easy
Ready to harvest — Zone 10
Harvest window: Apr – Jun

Planting Calendar

In Zone 10, Yellow Summer Squash should be planted outdoors Feb 1 – Mar 15, after the average last frost date of approximately Jan 15.

Spring crop is main season. August planting for October–November fall harvest.

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 10

Spring crop is main season. August planting for October–November fall harvest.

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 10, direct sow yellow summer squash outdoors Feb 1 – Mar 15 after your last frost date of approximately Jan 15. Spring crop is main season. August planting for October–November fall harvest.
Zone 10 has an average last spring frost of approximately Jan 15 and a first fall frost around Dec 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 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 10. Expected harvest window: Apr – Jun.

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Yellow Summer Squash in other zones
Crop Guides