Pick summer squash while it is small and glossy, and check the plants every day or two. Once one fruit swells to full size, the plant slows its output. What you pick keeps for about a week in the refrigerator, and no cellar changes that. A glut calls for the freezer, the pickle jar or a neighbor’s porch.
When summer squash are ready in New York
How do you tell a summer squash is ready?
Pick the fruit when the skin is glossy and a fingernail pierces it easily, while the fruit is still small for its type. Around New York City, plantings made after the last frost start producing about 55 days after planting, which usually means late June to mid-July. That 55-day count comes from Clemson Cooperative Extension and runs from sowing the seed or setting the plant in the ground.
Dull skin, a hard rind and swollen seeds mean you waited too long. A zucchini that has grown past a forearm’s length is mostly water and tough seeds. A pattypan bigger than your palm has the same problem. The plant also reads that big fruit as a finished job and eases off flowering. Harvest frequency is the yield. A healthy plant picked small and often can keep setting fruit for weeks, while one left alone for a long weekend may stall.
Cut the stem with a knife and leave a short stub on the fruit. Pulling or twisting can tear the vine. If you are still choosing what to grow, The Best Summer Squash to Grow in New York covers which types stay productive and which ones outgrow you fastest.
How do New York frost dates and summer weather change the timing?
At the Central Park reference station, the NOAA 1991-2020 normals put the last spring frost between March 23 and April 3, and the first fall frost between November 14 and November 27. Both ranges use the 30 to 70 percent probability band for a 32°F freeze. They describe a dense city site, so they are New York City figures and not statewide ones. Upstate and the Adirondacks frost earlier in fall and later in spring. There, the first picking comes later and the season ends sooner.
Squash dies in a frost and sulks in cold soil, so seeds go in well after those March and April dates, once the ground has warmed. For most of the state that means after the last spring frost, and you count 55 days forward from there. The USDA Plant Hardiness Zone Map (2023) runs from zone 3b to 7b across the state. That system rests on the average annual extreme minimum temperature, which tells you little about a crop that only lives through the warm months. Your county’s frost dates matter more, and Cornell Cooperative Extension can give them for your area.
Summer weather sets the pace once the plants are growing. The reference station averages 12.2 days a year at or above 90°F, and those are the days when plants wilt at midday and the soil dries quickly. June through August brings about 13.7 inches of rain, with June the driest month at 4.54 inches (July 4.6, August 4.56). Those are normals, not a forecast. The same inch of rain soaks into a sandy bed within a day and sits for a week on clay. A summer thunderstorm also runs off more than it soaks in. A rain gauge on your own plot tells you how often to water. Insects can end a harvest as surely as weather, which is what What Eats Summer Squash in New York, and When is about.
Keeping them, and for how long
How long does picked summer squash last?
Not long. Clemson Cooperative Extension’s Home & Garden Information Center advises storing summer squash in a plastic bag in the refrigerator for up to 1 week. Treat up to 1 week as a maximum. It assumes fruit picked young, free of bruises and cuts, and bagged soon after harvest. A squash that sat in the sun on the counter, or one that has a nick in the skin, gives you fewer days.
The thin skin is the reason. Winter squash grows a hard rind and cures for months in a cool, dry spot. Summer squash is picked immature, with a tender rind and high water content, so it softens, shrivels and then goes slimy. The plastic bag slows moisture loss from the skin, which is why the advice calls for it. A squash in the open air shrivels in days.
What can you do with a glut of summer squash?
Since the fridge buys you a week at best, the answer to a glut is to process it or pass it on. A single healthy plant can easily produce more than a household eats once the weather warms up. These routes work well:
- Shred zucchini, pack it in measured portions (a cup or two, the amount a bread recipe calls for) and freeze it.
- Slice or cube it, blanch briefly, cool, drain and freeze it for soups and stir-fries.
- Cook it down into sauce, ratatouille or soup and freeze the finished dish.
- Make pickles or relish from a tested recipe, or dry thin slices into chips.
- Give the extras to neighbors, a food pantry or a church kitchen, since many accept fresh produce.
Plain canned summer squash is not recommended by food-safety guidance, because the dense, low-acid flesh makes safe processing times hard to guarantee. If you want shelf-stable squash, use a tested pickle or relish recipe that adds acid. Your county’s Cornell Cooperative Extension office can point you to approved recipes.
Where in the house that actually is
The fridge is the one place the advice names, and it comes with a catch. A domestic refrigerator runs colder than some crops tolerate, and squash picked at summer-warm temperatures can show pitting or watery patches if the air around it is too cold. The crisper drawer is usually the mildest spot, and the plastic bag cushions the fruit from the coldest air. A heated kitchen is too warm, and a garage swings with the weather, from sun-baked in July to cold on a September night. Here is how the usual spots compare:
| Spot | What happens to summer squash |
|---|---|
| Crisper drawer, in a plastic bag | Closest to the recommended storage. Good for up to a week. |
| Open fridge shelf, no bag | Colder, drier air. Skin shrivels and may pit sooner. |
| Kitchen counter or heated room | Too warm. The fruit softens and shrivels within a couple of days. |
| Garage or porch | Temperature swings from sunny afternoons to cold nights. Unreliable either way. |
| Basement or cellar | Suits winter squash, but summer squash still softens quickly there. |
Fridges vary from one model to the next, and the back of the drawer is often colder than the front. Put a thermometer in the crisper drawer overnight before you trust it with a week’s harvest, because if the reading sits near freezing you will find pitted, watery squash by the weekend. If the drawer runs cold, move the bag to the front or to a shelf with the door-side air. Keep the squash dry, unwashed and away from the cooling vent. Wash it just before you cook it, since water left on the skin speeds rot. For the broader growing picture, Growing Summer Squash in New York ties the harvest back to planting and care.
Common questions
Is a giant zucchini still worth eating?
It is edible, but the flesh is watery and the seeds are tough. Scoop out the seeds and use the rest shredded in bread, fritters or soup. Better yet, pick the next ones sooner, since leaving a big fruit on the vine tells the plant to slow down.
Should you wash summer squash before storing it?
Wipe off soil with a dry cloth and wash it right before cooking. Moisture left on the skin speeds spoilage in the bag.
Can summer squash go in a root cellar like winter squash?
No. A cellar suits hard-rinded winter squash, which keeps for months. Summer squash has a thin skin and soft flesh, and the safe window is about a week in the fridge. For longer keeping, freeze it shredded or sliced after blanching, or turn it into a pickle or relish from a tested recipe.
How often should you check the plants in July and August?
Look every day or two once fruit starts coming. In hot spells, especially on days at or above 90°F, small fruit can double in size over a weekend. Daily picking keeps the fruit tender and keeps the plant flowering until frost ends the season, which comes in November in New York City and earlier upstate.