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

By reviewing the USDA zone info for Sonora you should be able to figure out when you can plant potatos.

Planting Calendar for Potatos

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

You can plant potatos quite a bit earlier in the year because they are very cold tolerant.

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

Last Frost Date

On average the last frost has passed is on February 15 in Sonora. In the coldest months of winter you should expect an average low temperature of 20°F.

Always keep in mind that USDA zone info for Sonora is an average and the actual date of last frost can change quite a bit from year to year. Since half of the time in Sonora you get surprised by a frost after February 15 be ready to cover your potatos if you have one of those late frosts.

USDA Zone Info for Sonora

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in Sonora

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