One of the best tools that you have as gardeners to help us determine 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.

The USDA zone info for Palmer should be read to figure out when it's possible to plant flowering kale.

Planting Calendar for Flowering Kale

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

Since flowering kale are moderately cold tolerant you can plant them a bit earlier in the year than other frost tender plants.

The earliest that you can plant flowering kale in Palmer 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 fully mature. You can get started a couple of weeks earlier by starting your flowering kale indoors.

Last Frost Date

In Palmer the average date of last frost happens on May 15. It might get as low as -25°F during the coldest months of winter.

Since the USDA zone info for Palmer is just an average the actual date of last frost can change quite a bit from year to year. Half of the time in Palmer you get surprised by a frost after May 15 so always be ready to cover your flowering kale in the event of a late frost.

USDA Zone Info for Palmer

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°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 -20°F.

Plants to Grow in Palmer

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