Broadly speaking, ranunculus are frost-hardy cool-season perennials. They perform best where winters are relatively mild and springs are long and cool. The roots tolerate soil temperatures to 10°F, while growing plants can handle temperatures below 20°F for several hours. Ranunculus are most popular in the mild-winter regions of the South and West, in states such as California, Nevada, Arizona, New Mexico, Texas, and Louisiana (USDA Hardiness Zones 8 through 11), where they grow best. Planted there in October or November, they flower in March.
Gardeners in zone 7 and north (Richmond and Reno to Minneapolis) can also grow ranunculus, but on a different schedule. In these regions, plant in early spring a week or two before the typical last frost. Or, plant them in pots indoors in February for transplanting later. Place pots in a south- or west-facing window or under grow lights. Temperatures around 55°F are ideal. In early spring, gradually acclimate plants to outdoors by putting them out for more time each day (bring them in at night). Plant outdoors by mid-April in zones 6 and 7 (mid-May in zones 4 and 5). Spring-planted ranunculus will bloom in June or July.
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I took the following excerpt from https://garden.org/learn/articles/view/757/ which has a very informative article about everything you want to know about ranunculus!
Where and How Ranunculus Grow Best
Broadly speaking, ranunculus are frost-hardy cool-season perennials. They perform best where winters are relatively mild and springs are long and cool. The roots tolerate soil temperatures to 10°F, while growing plants can handle temperatures below 20°F for several hours. Ranunculus are most popular in the mild-winter regions of the South and West, in states such as California, Nevada, Arizona, New Mexico, Texas, and Louisiana (USDA Hardiness Zones 8 through 11), where they grow best. Planted there in October or November, they flower in March.
Gardeners in zone 7 and north (Richmond and Reno to Minneapolis) can also grow ranunculus, but on a different schedule. In these regions, plant in early spring a week or two before the typical last frost. Or, plant them in pots indoors in February for transplanting later. Place pots in a south- or west-facing window or under grow lights. Temperatures around 55°F are ideal. In early spring, gradually acclimate plants to outdoors by putting them out for more time each day (bring them in at night). Plant outdoors by mid-April in zones 6 and 7 (mid-May in zones 4 and 5). Spring-planted ranunculus will bloom in June or July.
https://www.gardeningknowhow.com/ornamental/bulbs/ranunculus/growing-ranunculus-buttercups.htm