It should also be heavy for its size and free of mold or other blemishes. Stored at room temperature, an acorn squash will last one or two months; to determine if one has gone bad, slice it in two. Slimy, gray seeds are a good indicator that the squash has turned.
Similarly, is an acorn squash still good when it turns orange?
As long as it doesn't have soft spots, and when you cut it open there is no mold or rot inside, it is still fine. I've often used acorn squash that have partially turned orange, and yes, that is just further (but unneeded) ripening.
How do you know when an acorn squash is ripe?
Ripened acorn squash turns dark green in color. The portion that has been in contact with the ground will go from yellow to orange. In addition to color, the rind, or skin, of acorn squash will become hard. Another way to tell ripeness is to look at the plant's stem.
How long can you keep an acorn squash?
Acorn Squash Storage. Winter squash will last up to a month in a cool (50 to 55 degrees F) dark cellar or storage area, but only about two weeks in the refrigerator. Ideally, only cut or cooked acorn squash should be refrigerated.