Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A common way of making a decision about when it's the best time to plant asparagus is to look at the USDA zone info for Petaluma.

Planting Calendar for Asparagus

Frost tolerance for asparagus:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

You can plant asparagus a lot earlier in the year because they are very cold tolerant.

The earliest that you can plant asparagus in Petaluma 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 asparagus and expect a good harvest is probably October. If you wait any later than that and your asparagus may not have a chance to grow to maturity. You can get started a little bit earlier by starting your asparagus indoors.

Last Frost Date

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

Keep in mind that USDA zone info for Petaluma is not always accurate and the actual date of last frost can change quite a bit from year to year. Half of the time in Petaluma there is a last frost after February 15 so make sure that you are ready to cover your asparagus if you have one of those late frosts.

USDA Zone Info for Petaluma

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 Petaluma

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