The USDA Zone info is a great tool for gardeners to help us figure out 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 USDA zone info for Morton can be reffered to in order to determine when you can plant rosemary.

Planting Calendar for Rosemary

Frost tolerance for rosemary:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Since rosemary do well in cold you can plant them a lot earlier in the year than more sensitive plants.

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

Last Frost Date

On average the last frost is on April 15 in Morton. In the coldest months of winter you can expect an average low temperature of -15°F.

Since the USDA zone info for Morton is just an average the actual date of last frost can change quite a bit from year to year. Half of the time in Morton last frost occurs after April 15 so just be sure to be ready to protect your rosemary in the event of one of those late frosts.

USDA Zone Info for Morton

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 Morton

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