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.

One way of making a decision about when you can plant common hollyhock is to examine the USDA zone info for Brockton.

Planting Calendar for Common hollyhock

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

Common hollyhock can survive in a little bit of cold which means that you can plant them just a bit earlier in the year than other frost tender plants.

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

Last Frost Date

The average date of last frost is April 15 in Brockton. In the coldest months of winter you can expect an average low temperature of -5°F.

Remember that USDA zone info for Brockton is an average and the actual date of last frost is different every year. Half of the time in Brockton you get surprised by a frost after April 15 so make sure that you are ready to cover your common hollyhock in the event of a late frost.

USDA Zone Info for Brockton

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°F

This means that on a really cold year, the coldest it will get is -5°F. On most years you should be prepared to experience lows near 0°F.

Plants to Grow in Brockton

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