The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The first chance to plant common hollyhock in Dunellen should be estimated by looking at the USDA zone info.

Planting Calendar for Common hollyhock

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

You can plant common hollyhock just a bit earlier in the year because they are moderately cold tolerant.

The earliest that you can plant common hollyhock in Dunellen 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. You probably don't want to wait any later than that or else your common hollyhock may not have a chance to fully mature. If you are starting your common hollyhock indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Dunellen. It might get as low as -5°F during the coldest months of winter.

Always keep in mind that USDA zone info for Dunellen is not always accurate and the actual date of last frost is different every year. Since half of the time in Dunellen you get a frost after April 15 be ready to cover your common hollyhock if you have a surprise late frost.

USDA Zone Info for Dunellen

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 Dunellen

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