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

By using the USDA zone info for Madison you should be able to determine when it's possible to plant ajuga.

Planting Calendar for Ajuga

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

Ajuga do well in cold which means that you can plant them a quite a bit earlier than more sensitive plants.

The earliest that you can plant ajuga in Madison 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 ajuga and expect a good harvest is probably September. You probably don't want to wait any later than that or else your ajuga may not have a chance to grow to maturity. You can get started a little bit earlier by starting your ajuga indoors.

Last Frost Date

The average date of last frost is April 15 in Madison. In the coldest months of winter you should expect an average low temperature of -20°F.

Since the USDA zone info for Madison is just an average the actual date of last frost will vary from year to year. Half of the time in Madison you get a frost after April 15 so make sure that you are prepared to protect your ajuga if you have a late frost.

USDA Zone Info for Madison

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°F

This means that on a really cold year, the coldest it will get is -20°F. On most years you should be prepared to experience lows near -15°F.

Plants to Grow in Madison

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