Above 40 degrees Fahrenheit.
Aloe Plants in the Garden. As a rule, you cannot grow the Aloe vera plant outside of its recommended zones except in a container in summer, then move the plant indoors to a sunny location for the winter. In areas that have milder climates, you can grow wide variety of aloe plants in the garden. Try Aloe arborescens and Aloe ferox. Home gardeners often grow Aloe vera, commonly known as aloe, as a potted plant indoors. If you happen to live in U.S. department of Agriculture plant hardiness zones 10b or above, where temperatures remain above 40 degrees Fahrenheit, you can grow this plant outdoors as well. Aloe will thrive in full sun and well-draining soil in hot climates. Aloe vera, commonly known as aloe, grows in a wide variety of warm weather climates and soils. It reaches about 1 to 2 feet tall and wide at maturity, producing fleshy leaves and showy, yellow flowers. 1 Water aloe deeply but then allow the soil to dry at least 1 to 2 inches deep between waterings, in order to discourage rot; water even less in winter. 2  Aloe plants produce offsets or plantlets or “babies” that can be removed to produce an entirely new plant. Although Aloe Vera is a tropical plant, the root can survive freezing air temperatures, so long as the ground is not frozen and the root destroyed. The plant need not be destroyed for damage to occur. The leaves may be damaged and vital nutrients may be lost at air temperatures of forty degrees Fahrenheit. 1 Aloe Vera is a semi-tropical plant and will not tolerate cold temperatures. 2  Therefore, if you intend to use it as an outdoor plant, it is recommended only for Zones 9 and 10. 3  If you do not live in growing zones 9 or 10, but still dream about having an Aloe Vera plant or two, consider keeping it as a houseplant. Conversely, the plant can grow at temperatures as great as 104 F. It will survive temperatures higher still, and can withstand even severe drought. Nonetheless, it will thrive in humid jungles, so long as the root itself does not stand in water and drown.
http://www.gardeningknowhow.com/houseplants/aloe-vera/growing-aloe-outdoors.htm http://homeguides.sfgate.com/can-plant-aloe-vera-plant-outside-67996.html http://homeguides.sfgate.com/environment-needed-aloe-vera-plants-survive-67448.html http://www.almanac.com/plant/aloe-vera http://www.alpharubicon.com/prepinfo/aloeverapike.htm http://www.howtogrowstuff.com/how-to-grow-aloe-vera/ http://www.alpharubicon.com/prepinfo/aloeverapike.htm
what temperature can aloe survive