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.

A common way of figuring out when to plant erysimum is to use the USDA zone info for Milpitas.

Planting Calendar for Erysimum

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

Erysimum do well in moderate cold which means that you can start planting them earlier than other frost tender plants.

The earliest that you can plant erysimum in Milpitas 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 erysimum and expect a good harvest is probably October. Any later than that and your erysimum may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your erysimum indoors.

Last Frost Date

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

Since the USDA zone info for Milpitas may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Half of the time in Milpitas it frosts late in the year after February 15 so just be sure to be ready to protect your erysimum if you have one of those late frosts.

USDA Zone Info for Milpitas

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 Milpitas

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