Unlike avocados, mangos, and other similar ingredients, tomatillos are firm when unripe and ripe, so you can’t always tell a tomatillo’s ripeness by feel alone. However, if it’s squishy/mushy, then it’s overripe (avoid!). Look for tomatillos with nice green color and don’t have lots of blemishes or damaged/shriveled skin. If the husks are loose and easy to remove, even better!