There are three critical temperatures for mold: the temperature below which no mold growth occurs, the temperature above which no mold growth occurs, and the temperature at which most rapid mold growth takes place. Most mold species grow in temperatures ranging from 59º to 95º F (15º to 35° C), although there are molds which will grow at almost freezing and others which thrive at over 150º F. The average optimum for mold growth is usually stated to be in the vicinity of 86° F. Freezing mold does not kill mold spores or mold colonies—they become dormant waiting for warm temperatures and access to moisture to grow again.