My Instant Pot spaghetti squash is tender with perfect strands in under 30 minutes — 7 minutes of pressure cooking plus natural release. The easiest low-carb pasta swap.
Cut the spaghetti squash in half lengthwise. This is the hardest part—use a sharp, sturdy chef's knife and cut slowly. Scoop out the seeds and stringy pulp with a spoon.
Pour water into the Instant Pot and place the trivet inside.
Place the squash halves on the trivet, cut side up (this prevents water from pooling inside).
Lock the lid and set the valve to "Sealing." Cook on high pressure for 7 minutes for al dente strands, or 8 minutes for softer strands.
When cooking is complete, carefully release pressure manually using a long utensil or towel to protect your hand from the steam.
Let cool for 5 minutes until safe to handle. Use a fork to scrape lengthwise, separating the flesh into strands.
Notes
Squash size affects timing: For a smaller squash (under 2 lbs), reduce time to 6 minutes. For a larger squash (over 3 lbs), increase to 9-10 minutes.
The squash is done when a fork easily pierces the flesh and the strands separate without resistance.
If you find raw squash difficult to cut, you can cook it whole first (add 5 minutes to cooking time), then halve and seed it after—the softened squash is much easier and safer to cut.