Hardiness varies considerably among the different types. Most of the tender succulents with rosettes of thick fleshy leaves, such as many of the Echeveria, are partially hardy to at least the mid 20's F. Tender succulents with thinner individual leaves, like most Kalanchoe, can briefly tolerate temperatures just below freezing but are killed back to the roots when the temperature reaches the mid 20's F.
This modest hardiness means that they do well outdoors in areas that receive only light frost (such as many coastal locations) and in protected spots in colder areas.
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