One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A way of determining when it's possible to plant chervil is to consult the USDA zone info for Pewaukee.

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.

Since chervil do ok in moderate cold you can plant them a bit earlier in the year than other frost tender plants.

The earliest that you can plant chervil in Pewaukee 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 chervil and expect a good harvest is probably August. Any later than that and your chervil may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your chervil indoors.

Last Frost Date

The average date of last frost is April 15 in Pewaukee. You should expect an average low temperature of -20°F in the coldest months of winter.

Since the USDA zone info for Pewaukee is just an average the actual date of last frost changes from year to year. Since half of the time in Pewaukee you get a frost after April 15 be ready to cover your chervil if you have a surprise late frost.

USDA Zone Info for Pewaukee

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°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 -15°F.

Plants to Grow in Pewaukee

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