One of the best tools that you have as gardeners to help us figure out 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 should be able to figure out when to plant columbine by reviewing the USDA zone info for New Prague.

Planting Calendar for Columbine

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

Since columbine are moderately cold tolerant you can plant them just a bit earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant columbine in New Prague 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 columbine and expect a good harvest is probably August. If you wait any later than that and your columbine may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your columbine indoors.

Last Frost Date

On average the last frost is on May 15 in New Prague. You can expect an average low temperature of -25°F in the coldest months of winter.

Remember that the actual date of last frost is not always accurate because it is based on the USDA zone info for New Prague and it will vary from year to year. Since half of the time in New Prague there is a last frost after May 15 be ready to cover your columbine in the event of one of those late frosts.

USDA Zone Info for New Prague

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in New Prague

You may be interested in your other planting guides for New Prague.