One of the first steps you take when you are estimating your gardening schedule is find your USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The USDA zone info for Castle Rock should be looked at to determine when it's a good idea to plant mustard.

Planting Calendar for Mustard

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

You really shouldn't plant mustard until after all chance of frost has passed because they require warm weather.

The earliest that you can plant mustard in Castle Rock is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant mustard and expect a good harvest is probably August. You probably don't want to wait any later than that or else your mustard may not have a chance to really do well. You can get started a little bit earlier by starting your mustard indoors.

Last Frost Date

The average date of last frost is April 15 in Castle Rock. It might get as low as -15°F during the coldest months of winter.

Always keep in mind that USDA zone info for Castle Rock is not always accurate and the actual date of last frost is different every year. Half of the time in Castle Rock you get a frost after April 15 so just be sure to be ready to cover your mustard in the event of one of those late frosts.

USDA Zone Info for Castle Rock

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Castle Rock

You may be interested in your other planting guides for Castle Rock.