Skip to content
Grow In Backyard
Harvesting & Storing

How to Tell When Acorn Squash Is Ripe: Four Checks

A ripe acorn squash has a hard rind, a dry corky stem, a deep orange ground spot and dull skin. Days to maturity and how to cure it.

By Zakaria 2 min read Save to Pinterest — opens Pinterest in a new tab
A pile of mixed winter squash and gourds at harvest
Photo: Ralphs_Fotos, Pixabay Content License, via Pixabay
On this page

Four signs tell you, and all four need to agree. Days-to-maturity only tells you when to start looking.

The four checks

checknot readyready
RindThumbnail dents itThumbnail leaves no mark
StemGreen, soft, fleshyDry, brown, corky
Ground spotPale cream or yellowDeep orange
SkinGlossyDull, matte

Over-ripe, and why it matters

A fully ripe acorn squash stays dark green with an orange patch. If the whole fruit is turning orange it has been on the vine too long:

  • Stringier texture
  • Less sweetness, since sugars convert as the seeds mature
  • Shorter storage life

It remains edible — use it soon rather than storing it.

Harvesting

  1. Cut, with a knife or secateurs, leaving one to two inches of stem
  2. Never pull or twist. A broken stem is the usual cause of storage rot
  3. Do not carry it by the stem
  4. Handle it like eggs. Invisible bruises become soft spots
  5. Wipe off soil with a dry cloth; do not wash it

Acorn squash is the one you do not cure

Butternut, hubbard and most winter squash improve with a week or two at 80 to 85 °F. Acorn squash loses sweetness and quality in heat. Give it a few days at room temperature to dry the skin, then move it straight to cool storage.

Storage

conditionresult
50–55 °F, dry, good airflow, single layer1–2 months
Warm roomWeeks; quality falls
RefrigeratedChilling injury; do not
Touching each other or stackedSoft spots spread

Check stored fruit weekly and use anything with a soft spot immediately.

If frost is coming

Harvest everything. Frost damage to the rind leads directly to storage rot. Use the immature fruit straight away — a half-ripe acorn squash cooks well as a summer squash.

Common questions

How do you know when acorn squash is ready to pick?

Four checks together, not one. The rind should resist a thumbnail rather than dent; the stem should be dry, brown and corky rather than green and fleshy; the ground spot where the fruit sat should have turned from pale yellow to a deep orange; and the skin should look dull rather than glossy. A squash passing all four is ripe. Days from planting — usually 80 to 100 for acorn types — tells you roughly when to start checking, not when to harvest.

Does acorn squash turn orange when ripe?

Only the ground spot should. A fully ripe acorn squash stays dark green overall with a distinct deep orange patch where it rested on the soil. If the whole fruit is turning orange it has been left on the vine too long — overripe acorn squash becomes stringy, loses sweetness and stores poorly, though it is still perfectly edible. Some varieties are bred orange or white from the start, so know what you planted.

How long does acorn squash take to mature?

Typically 80 to 100 days from sowing, varying by variety and by how warm the season has been. Mark the date you sowed or planted out, start checking the four ripeness signs about a week before the earliest figure on the seed packet, and do not harvest on the calendar alone — a cool summer pushes everything back by a week or two. Fruit set late in the season may never fully ripen and is best used immediately as a summer squash.

Should acorn squash be cured before storing?

Not in the same way as butternut or hubbard, and this is where acorn differs from other winter squash. Acorn squash does not benefit from a warm cure and in fact loses quality and sweetness if held at high temperature; a few days at room temperature to dry the skin and heal small wounds is enough. Store it cool at around 50 to 55 °F with good air circulation, where it keeps for one to two months — considerably less than other winter squash.

How should acorn squash be cut from the vine?

With a knife or secateurs, leaving one to two inches of stem attached, and never by pulling or twisting. The stem is the seal: a squash harvested without one rots from the stem scar within weeks, and a broken stem is the commonest cause of storage losses. Handle the fruit like eggs — bruises you cannot see become soft spots in storage — and do not carry a squash by the stem, which snaps it off.

What if frost is forecast before they are ripe?

Harvest everything, ripe or not. Frost damages winter squash rinds and the damage leads directly to rot in storage, so a light frost warning is the hard deadline on the season. Pick the mature fruit for storage and use the immature ones straight away — a half-ripe acorn squash is good cooked like a summer squash or courgette. Covering the patch with a sheet buys a night or two if the fruit are genuinely close.

Backyard Weekly

Know what to plant, week by week

Join the weekly email for seasonal jobs, fixes for what is going wrong, and gear worth buying.

Not ready to subscribe? The planting calendar is free and needs no email.

By subscribing you agree to our privacy policy. Grow In Backyard will never sell your address.

Keep reading