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.

A common way of determining when to plant blue throatwort is to consult the USDA zone info for Fairfield.

Planting Calendar for Blue Throatwort

Frost tolerance for blue throatwort:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

Since blue throatwort are not cold tolerant you really should wait until after the last frost has passed before you can plant them.

The earliest that you can plant blue throatwort in Fairfield 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 blue throatwort and expect a good harvest is probably September. Any later than that and your blue throatwort may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your blue throatwort indoors.

Last Frost Date

In Fairfield the average date of last frost happens on February 15. It might get as low as 25°F during the coldest months of winter.

Since the USDA zone info for Fairfield is an average the actual date of last frost is different every year. Half of the time in Fairfield there is a last frost after February 15 so just be sure to be ready to protect your blue throatwort if you have a surprise late frost.

USDA Zone Info for Fairfield

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°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 30°F.

Plants to Grow in Fairfield

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