The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Watertown you can determine when it's possible to plant flowering kale by reviewing the USDA zone info.

Planting Calendar for Flowering Kale

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

Flowering Kale are moderately cold tolerant which tells us that you can get them planted earlier than more sensitive plants.

The earliest that you can plant flowering kale in Watertown 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 flowering kale and expect a good harvest is probably August. If you wait any later than that and your flowering kale may not have a chance to really do well. You can get started a few weeks earlier by starting your flowering kale indoors.

Last Frost Date

The average date of last frost is May 15 in Watertown. You can expect an average low temperature of -30°F in the coldest months of winter.

Always keep in mind that the actual date of last frost is not always accurate because it is based on the USDA zone info for Watertown and it can change quite a bit from year to year. Since half of the time in Watertown you get a frost after May 15 be ready to protect your flowering kale if you have a surprise late frost.

USDA Zone Info for Watertown

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Watertown

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