One of the best tools that you have as gardeners to help us figure out 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.

By referring to the USDA zone info for Calistoga it's a good idea to figure out when it's a good idea to plant stoneseed.

Planting Calendar for Stoneseed

Frost tolerance for stoneseed:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

It's not a good idea to plant stoneseed until after the last frost because they are not cold tolerant.

The earliest that you can plant stoneseed 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 stoneseed and expect a good harvest is probably September. You probably don't want to wait any later than that or else your stoneseed may not have a chance to really do well. Starting your stoneseed indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on February 15 in Calistoga. In the coldest months of winter you can expect an average low temperature of 20°F.

Since the USDA zone info for Calistoga is an average the actual date of last frost changes from year to year. Half of the time in Calistoga you get a frost after February 15 so always be ready to protect your stoneseed if you have a 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.