One of the first steps you take when you are determining your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Gridley you can estimate when it's the best time to plant mustard by referring to the USDA zone info.

Planting Calendar for Mustard

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

It's a bad idea to plant mustard until after the last frost because they are not cold tolerant.

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

Last Frost Date

On average the last frost is on February 15 in Gridley. In the coldest months of winter you should expect an average low temperature of 25°F.

It's important to remember that USDA zone info for Gridley may not be accurate from year to year and the actual date of last frost will vary from year to year. Half of the time in Gridley last frost occurs after February 15 so make sure that you are ready to cover your mustard if you have one of those late frosts.

USDA Zone Info for Gridley

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 Gridley

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