How long to dehydrate zucchini

Last reviewed July 2026.

Roughly 6 to 10 hours at 135–140°F, until the slices are crisp and brittle. Penn State Extension dries zucchini at about 135°F in around 6 hours; Utah State University Extension dries summer squash at 140–145°F for 8–10 hours "or until slices are crisp and brittle." The spread is real and it's about slice thickness, humidity, and airflow — not a secret setting. The finish line is not the clock, it's the texture: USU's own dryness test is a slice "dry enough that it would shatter if you hit it with a hammer." Zucchini is mostly water, so it takes its time and then goes suddenly crisp.

Slice thin, blanch, single layer

Cut ¼-inch slices — uniform thickness is what lets a tray finish together, so a mandolin earns its keep here. Extension guidance blanches summer squash before drying (steam roughly 2½–3 minutes, or a short water blanch; USU adds 1 teaspoon of citric acid per gallon to the blanching water), which sets the color and shortens drying. Drain, then arrange in a single layer so air reaches every face. Ten pounds of fresh squash dries down to about ¾ pound, so fill the trays — it shrinks dramatically.

"And what temp" for chips, and how to make them crispy

The most-searched variant is zucchini chips — how long and what temp. Same window: 135–140°F until brittle. Crispness comes from three things, none of them a hotter dial:

• Thin, even slices — thinner chips lose water faster and snap harder; discard any piece cut too thick to finish with the rest.
• Drying all the way to brittle — a chip that still bends isn't done. Take it to "shatters," not "leathery."
• A light oil-and-season finish after cooling — Penn State's chip method rubs no more than a teaspoon of oil across the cooled chips and adds seasoning before packing. Oil before drying just goes rancid in storage; finish after.

One storage catch worth knowing: dried squash reabsorbs moisture from the air quickly and softens, so keep chips sealed until you're ready to eat them — don't leave them open on the counter.

In an air fryer, or in an oven

An air fryer on a dehydrate setting is a small, high-airflow box: it can crisp a thin single layer of zucchini fast, but the basket holds little and a strong fan turns brittle into burnt quickly, so watch it rather than trust a preset time. An oven works on the same principle — lowest setting, ideally near 135–140°F, door propped for airflow, and expect it to run long because a home oven moves less air than a dehydrator. In all three the temperature is the same record window and the test is the same snap; only the airflow, and therefore the hours, change.

Cucumbers and zucchini together

Cucumber and zucchini dry in the same temperature window, so a mixed tray of chips is fine as long as you slice them to the same thickness so they finish together. Cucumber carries even more water than zucchini and can run a little longer; pull pieces as they crisp rather than waiting for the slowest one. As with all vegetable drying, brittle — not leathery — is the target for shelf storage.

Sources — read them yourself

• Penn State Extension — Use It All: Drying Zucchini (~135°F, ~6 h, "shatter" doneness, chip oil-finish)
• Utah State University Extension — Summer Squash (140–145°F, 8–10 h, crisp and brittle, blanch, 10 lb → ¾ lb)
• NCHFP — Drying foods at home (vegetable drying temperatures and doneness)

Related: how long to dehydrate apples · how long to dehydrate tomatoes · why produce dries at ~135–140°F, not 165°F.

Dehydrator Score indexes published specs and marketing claims against the USDA/NCHFP record, with attribution — we test nothing and give no safety advice. For drying guidance use NCHFP or your extension office. If a source changes, the page changes — the record wins.