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.

By checking out the USDA zone info for Zone 4a you should be able to estimate when you can plant veronica.

Planting Calendar for Veronica

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

Veronica do well in moderate cold which means that you can plant them a little bit earlier than other plants that might not handle the cold.

The earliest that you can plant veronica in Zone 4a is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant veronica and expect a good harvest is probably August. You probably don't want to wait any later than that or else your veronica may not have a chance to grow to maturity. If you are starting your veronica 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 May 15 in Zone 4a. In the coldest months of winter you can expect an average low temperature of -30°F.

Keep in mind that the actual date of last frost is not always accurate because it is based on the USDA zone info for Zone 4a and it can change quite a bit from year to year. Half of the time in Zone 4a you get surprised by a frost after May 15 so make sure that you are ready to protect your veronica if you have one of those late frosts.

USDA Zone Info for Zone 4a

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Zone 4a

You may be interested in your other planting guides for Zone 4a.