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.

It's possible to determine when it's possible to plant hollyhocks by reviewing the USDA zone info for Crest Hill.

Planting Calendar for Hollyhocks

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

Hollyhocks can survive in mild cold which means that you can plant them a little bit earlier in the year than more sensitive plants.

The earliest that you can plant hollyhocks in Crest Hill 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 hollyhocks and expect a good harvest is probably September. You probably don't want to wait any later than that or else your hollyhocks may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your hollyhocks indoors.

Last Frost Date

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

It's important to remember that USDA zone info for Crest Hill is just an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Crest Hill it frosts late in the year after April 15 so make sure that you are prepared to cover your hollyhocks in the event of a surprise late frost.

USDA Zone Info for Crest Hill

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Crest Hill

You may be interested in your other planting guides for Crest Hill.