Overwintering guide
How to overwinter acorn squash
Winter watering
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
The mistake that kills acorn squash in winter
Cutting acorn squash hard back in autumn "to tidy up". That removes the growth that shelters the crown, and on some plants removes next season's flower buds entirely.
More acorn squash care
- Overwintering squash — the species this cultivar belongs to
- Overwintering acorn squash — our other guide for the same plant
- Full acorn squash care guide
- Acorn Squash temperature range
- How often to water acorn squash
- How to prune acorn squash
- Common acorn squash problems & fixes
- Best plant identifier apps — tested and ranked
Overwintering acorn squash — FAQ
Does acorn squash need to come indoors for winter?
Acorn Squash is hardy to roughly USDA zone 3 — winter lows around -40°C. That means it can stay outside all winter in most temperate gardens. Acorn Squash is properly hardy and overwinters outside without fuss. Tidy away anything dead or diseased, apply a mulch over the crown to steady soil temperatures, and otherwise leave it alone — many hardy plants actually need a cold period to flower and grow well the following year. Save hard pruning for the right season rather than doing it in autumn.
When should I move acorn squash for winter?
Tidy and mulch in late autumn; leave the plant undisturbed until spring.
How often should I water acorn squash in winter?
No winter watering needed in open ground. Containers only need water in long dry, frost-free spells.
What kills acorn squash over winter?
Cutting acorn squash hard back in autumn "to tidy up". That removes the growth that shelters the crown, and on some plants removes next season's flower buds entirely.