One of the first steps you take when you are getting a good idea 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.

The USDA zone info for Boulder City should be read to estimate when it's the best time to plant chervil.

Planting Calendar for Chervil

Frost tolerance for chervil:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Chervil do well in mild cold which tells us that you can plant them slightly earlier in the year than more sensitive plants.

The earliest that you can plant chervil in Boulder City is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant chervil and expect a good harvest is probably September. Any later than that and your chervil may not have a chance to fully mature. You can get started a little bit earlier by starting your chervil indoors.

Last Frost Date

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

Since the USDA zone info for Boulder City is not always accurate the actual date of last frost changes from year to year. Half of the time in Boulder City it frosts late in the year after February 15 so make sure that you are ready to cover your chervil in the event of a surprise late frost.

USDA Zone Info for Boulder City

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 Boulder City

You may be interested in your other planting guides for Boulder City.