Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The USDA zone info for Suisun City should be read to determine when you can plant tithonia.

Planting Calendar for Tithonia

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

Tithonia do not do well in cold weather which means that it is important to wait until it warms up after the last frost before you can plant them.

The earliest that you can plant tithonia in Suisun City 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 tithonia and expect a good harvest is probably September. You probably don't want to wait any later than that or else your tithonia may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your tithonia indoors.

Last Frost Date

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

Just be sure to remember that USDA zone info for Suisun City may not be accurate from year to year and the actual date of last frost changes from year to year. Half of the time in Suisun City it frosts late in the year after February 15 so be sure to be ready to protect your tithonia in the event of a late frost.

USDA Zone Info for Suisun City

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 Suisun City

You may be interested in your other planting guides for Suisun City.