The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Grass Valley you can figure out when you can plant stoneseed by using the USDA zone info.

Planting Calendar for Stoneseed

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

You can not plant stoneseed until after the last frost when the weather gets warmer because they are not cold tolerant.

The earliest that you can plant stoneseed in Grass Valley 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. If you are starting your stoneseed indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

On average the last frost has passed is on February 15 in Grass Valley. In the coldest months of winter you should expect an average low temperature of 20°F.

Since the USDA zone info for Grass Valley is just an average the actual date of last frost is different every year. Since half of the time in Grass Valley there is a last frost after February 15 be ready to cover your stoneseed in the event of a late frost.

USDA Zone Info for Grass Valley

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 Grass Valley

You may be interested in your other planting guides for Grass Valley.