One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You will be able to estimate when it's a good idea to plant mimulus by using the USDA zone info for Calistoga.

Planting Calendar for Mimulus

Frost tolerance for mimulus:	Not tolerant of frost.
When to plant:	After the last frost.

Since mimulus require warm weather it is important to wait until after the last frost before you can plant them.

The earliest that you can plant mimulus in Calistoga is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant mimulus and expect a good harvest is probably September. Any later than that and your mimulus may not have a chance to fully mature. Starting your mimulus indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is February 15 in Calistoga. It might get as low as 20°F during the coldest months of winter.

Always keep in mind that USDA zone info for Calistoga is an average and the actual date of last frost is different every year. Half of the time in Calistoga last frost occurs after February 15 so be sure to be ready to cover your mimulus in the event of a surprise late frost.

USDA Zone Info for Calistoga

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in Calistoga

You may be interested in your other planting guides for Calistoga.