Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By looking at the USDA zone info for Ashland City it's a good idea to estimate when it's possible to plant penstemon.

Planting Calendar for Penstemon

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

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

The earliest that you can plant penstemon in Ashland City 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 penstemon and expect a good harvest is probably September. Any later than that and your penstemon may not have a chance to fully mature. You can get started a few weeks earlier by starting your penstemon indoors.

Last Frost Date

The average date of last frost is April 15 in Ashland City. You should expect an average low temperature of 0°F in the coldest months of winter.

Remember that USDA zone info for Ashland City may not be accurate from year to year and the actual date of last frost will vary from year to year. Half of the time in Ashland City last frost occurs after April 15 so be sure to be ready to protect your penstemon in the event of a late frost.

USDA Zone Info for Ashland City

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Ashland City

You may be interested in your other planting guides for Ashland City.