Pick two to three avocados when the fruit has developed its full-green or greenish-black color and has reached full size. Maturity time depends on the variety with Hass types typically ripening in midwinter, Mexican varieties in summer and hybrids ripening in fall.
Place the avocados in a paper bag. Fold the top of the bag loosely over, so that some air circulates into the bag.
Keep the avocados at room temperature for seven to 10 days or until they begin softening. The avocados are ripe once they give slightly when you apply gentle pressure to them.
Cut the avocado and perform a taste test. The avocados are ripe and the rest are ready for harvest if the fruit softens and develops a good flavor and texture after ripening.