The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You should be able to determine when it's the best time to plant ruby grass by reviewing the USDA zone info for Napa.

Planting Calendar for Ruby Grass

Frost tolerance for ruby grass:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

You can plant ruby grass a bit earlier in the year because they are one of those plants that can tolerate a tiny bit of cold weather.

The earliest that you can plant ruby grass in Napa is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant ruby grass and expect a good harvest is probably September. Any later than that and your ruby grass may not have a chance to fully mature. You can get started a few weeks earlier by starting your ruby grass indoors.

Last Frost Date

The average date of last frost is February 15 in Napa. In the coldest months of winter you should expect an average low temperature of 25°F.

Keep in mind that USDA zone info for Napa is just an average and the actual date of last frost changes from year to year. Half of the time in Napa you get surprised by a frost after February 15 so just be sure to be ready to cover your ruby grass in the event of one of those late frosts.

USDA Zone Info for Napa

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Napa

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