Before planting it is a good idea to find your USDA Zone info to determine 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.

In American Canyon you can estimate when it's a good idea to plant sunflowers by looking at the USDA zone info.

Planting Calendar for Sunflowers

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

You should not plant sunflowers until after the last frost has passed because they do not do well in cold weather.

The earliest that you can plant sunflowers in American Canyon 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 sunflowers and expect a good harvest is probably September. If you wait any later than that and your sunflowers may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your sunflowers indoors.

Last Frost Date

On average all chance of frost has passed is on February 15 in American Canyon. It might get as low as 25°F during the coldest months of winter.

It's important to remember that USDA zone info for American Canyon may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Since half of the time in American Canyon there is a last frost after February 15 be ready to protect your sunflowers in the event of a surprise late frost.

USDA Zone Info for American Canyon

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 American Canyon

You may be interested in your other planting guides for American Canyon.