Summer squash is a crop you pick young, eat fast, and freeze when the pile gets ahead of you. Nova Scotia gardens usually start cutting fruit in mid to late summer, and one week in the refrigerator is the longest a fresh squash holds. A cellar won’t help, because that trick belongs to winter squash. Here is how to time the harvest and where to keep what you cut.
When summer squash are ready in Nova Scotia
Summer squash are ready when the fruit is still small and glossy and the skin gives easily to a thumbnail. In Nova Scotia that usually means mid-July to early August for seed sown after the last frost. Clemson Cooperative Extension puts the wait at about 55 days after planting, counted from sowing when seed goes straight into the garden.
The window comes from the frost dates. At the Halifax Stanfield station, Environment and Climate Change Canada’s 1981-2010 normals give a mean last spring frost of May 7. That is the midpoint, so in one year out of two the last frost lands later. Tender squash seed goes in once frost risk has passed and the soil has warmed, which for most gardens means late May into early June. Add roughly 55 days and you get mid-July to early August for the first picking. A cold, foggy spring, or a garden on the cool coast, pushes that later.
The reference station has about 164 frost-free days between the mean last spring frost on May 7 and the mean first fall frost on October 18. That leaves a long stretch for picking once the first fruit comes. Summers there are mild: the station averages 2.8 days a year above 30 °C, and only 0.6 days above 32 °C. Squash grows well in that kind of season.
How do Nova Scotia frost dates shift the picking window?
The Halifax numbers describe one airport. Northern and upland districts, such as parts of Cape Breton and the Cobequid hills, run weeks behind them, and a sheltered valley can run ahead. The same station sits in zone 6b of Natural Resources Canada’s hardiness system, which is a separate scale from the USDA map and doesn’t convert to it. For your own plot, the practical signal is the plant. Sow when the soil is warm and no frost is forecast, then watch for the first yellow blossoms. Fruit follows within days.
The fall end of the window is just as loose. October 18 is the mean first frost, so in half of years it arrives earlier. When a frost warning appears, cut everything of usable size that evening, because a frosted plant stops producing.
How often should you pick summer squash?
Every day or two once the plant is producing. A summer squash plant slows down or stops setting new fruit once one fruit is allowed to mature, so how often you pick decides how much you get. One forgotten oversized squash hiding under the leaves can shut down the whole plant’s output. Cut with a short stem attached, and wear gloves if the stems are prickly.
Check the undersides of the fruit as you go. Chewed patches and scarred skin are common, and What Eats Summer Squash in Nova Scotia, and When explains what causes them. Varieties also differ in how fast they set fruit and how big they get before the skin toughens, which The Best Summer Squash to Grow in Nova Scotia covers. For the full season, from sowing to the last picking, see Growing Summer Squash in Nova Scotia.
Keeping them, and for how long
Clemson Cooperative Extension’s Home & Garden Information Center says to store summer squash in a plastic bag in the refrigerator for up to 1 week. The refrigerator supplies the cold and the bag holds in moisture. The week is a ceiling, reached only by fruit picked young, free of nicks, and chilled soon after cutting. A squash that sat in the sun, got bruised, or was picked oversized will go soft sooner.
This is where summer squash parts ways with winter squash. A butternut or a hubbard is picked mature, has a hard rind, and keeps for months in a cool, dry spot. Summer squash is harvested immature, with a thin skin you can dent with a fingernail, and it has no rind to protect it. Planning to store a glut, as you would a pumpkin, leads to a shelf of slimy zucchini by the second week.
What do you do with a glut of summer squash?
Freeze it, cook it, or give it away. The answer is the same for a vegetable that can’t be stored fresh, and it works best when you process the squash within a day or two of cutting.
Raw slices turn watery after thawing, so shred or cook the squash first. Shredded squash, packed in freezer bags in amounts you would use in one batch of bread, muffins, or soup, is the easiest route. Grilled or sautéed slices also freeze and go straight into casseroles. Pickles and relishes keep on the shelf, but use a tested recipe, since the acidity and processing time are what keep them safe. The Nova Scotia Department of Agriculture is a good place to start for local guidance, and the Clemson factsheet covers the basics of handling the harvest.
Whatever you can’t use, hand over while it’s fresh. Neighbours, coworkers, and many food banks are glad to take garden produce in August, and a squash you give away on day one is worth more than one you pitch on day nine.
Where in the house that actually is
The refrigerator is the closest match, which is what the Clemson advice assumes. The crisper drawer, with the squash loosely bagged, is the best spot. But a domestic fridge runs colder at the back wall and near the vent than at the front, and warm-season vegetables can be damaged by cold that a head of cabbage shrugs off. Squash pressed against a cold wall can turn pitted and watery in a few days, long before the week is up.
Put a thermometer in the crisper drawer for a day before the glut arrives, and skip this check at the price of ruined fruit. If a cup of water left on that shelf ices over, the setting is too cold for squash, so turn the dial up a notch or move the bag to the middle shelf, away from the back. Fruit that is wet from rain or washing should be wiped dry before bagging, because trapped water speeds rot.
A heated kitchen is too warm for anything beyond the squash you plan to cook that night. A garage or unheated porch swings with the weather, which in Nova Scotia can mean a cool, damp night followed by a sun-warmed afternoon, and that back-and-forth is hard on thin-skinned fruit. A basement or cellar is a good place for winter squash and potatoes. For summer squash it is the wrong tool, since the humidity that suits a hard-rinded pumpkin invites rot in a tender one.
Wet spells add to the problem. At Halifax Stanfield, 1981-2010 normals give 284 mm (about 11.2 inches) of rain across June, July, and August, with August the driest of the three at 93 mm (3.68 inches). Normals describe a typical summer rather than your garden, and a rain gauge on your own plot tells you what actually fell. After a soaking week, fruit comes in carrying extra moisture, and it keeps best when you dry it before it goes in the fridge.
Common questions
How do I know a summer squash is ready to pick?
Look for small, glossy fruit with skin that a thumbnail pierces easily. A dull, hard skin means the squash has gone past its best. Plan on about 55 days from planting, which in Nova Scotia puts the first fruit in mid-July to early August for seed sown after the last frost.
How long does summer squash keep in the refrigerator?
Clemson Cooperative Extension says up to 1 week in a plastic bag in the refrigerator. That is the maximum under good conditions. Fruit that was bruised, picked large, or left warm for hours will not last that long.
Can I store summer squash in a cellar like winter squash?
No. Winter squash has a hard rind and is picked mature, so it can sit for months. Summer squash has thin skin and is picked young, so a cellar only speeds its decline. Freeze or preserve what you can’t eat within the week.
When does the summer squash harvest end in Nova Scotia?
When frost kills the plants. The mean first fall frost at Halifax Stanfield is October 18, so in half of years it comes earlier, and inland or upland gardens often see frost sooner. When a frost warning appears, cut every fruit of usable size that day and process or refrigerate it.