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.

You can estimate when it's the best time to plant veronica in Crookston by referring to the USDA zone info.

Planting Calendar for Veronica

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

Since veronica are one of those plants that can tolerate a little bit of cold weather you can plant them a little earlier in the year than other frost tender plants.

The earliest that you can plant veronica in Crookston 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. Any later than that and your veronica may not have a chance to fully mature. Starting your veronica indoors is a great way to get them started a little bit earlier.

Last Frost Date

In Crookston the average date of last frost happens on May 15. You should expect an average low temperature of -30°F in the coldest months of winter.

It's important to remember that USDA zone info for Crookston is not always accurate and the actual date of last frost is different every year. Half of the time in Crookston there is a last frost after May 15 so make sure that you are prepared to protect your veronica in the event of a late frost.

USDA Zone Info for Crookston

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 Crookston

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