The USDA Zone info is a great tool for gardeners to help us determine 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.

By using the USDA zone info for Sonoma you will be able to figure out when it's the best time to plant daylily.

Planting Calendar for Daylily

Frost tolerance for daylily:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Daylily do well in moderate cold which tells us that you can start planting them earlier than more sensitive plants.

The earliest that you can plant daylily in Sonoma is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant daylily and expect a good harvest is probably October. If you wait any later than that and your daylily may not have a chance to grow to maturity. Starting your daylily indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost has passed is on February 15 in Sonoma. In the coldest months of winter you can expect an average low temperature of 25°F.

Since the USDA zone info for Sonoma is not always accurate the actual date of last frost changes from year to year. Since half of the time in Sonoma last frost occurs after February 15 be ready to cover your daylily if you have a surprise late frost.

USDA Zone Info for Sonoma

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 Sonoma

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