Before planting it is a good idea to find your USDA Zone info to determine 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.

A common way of determining when to plant periwinkles is to use the USDA zone info for Fairfield.

Planting Calendar for Periwinkles

Frost tolerance for periwinkles:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Periwinkles require warm weather which means that you really should wait until it warms up after the last frost before you can plant them.

The earliest that you can plant periwinkles in Fairfield is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant periwinkles and expect a good harvest is probably August. Any later than that and your periwinkles may not have a chance to fully mature. If you are starting your periwinkles indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

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

Since the USDA zone info for Fairfield may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Half of the time in Fairfield it frosts late in the year after April 15 so always be ready to cover your periwinkles if you have a surprise late frost.

USDA Zone Info for Fairfield

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Fairfield

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