The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

It's a good idea to determine when you can plant periwinkles by looking at the USDA zone info for Arroyo Grande.

Planting Calendar for Periwinkles

Frost tolerance for periwinkles:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Periwinkles are not cold tolerant which means that it's necessary to wait until it warms up after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant periwinkles in Arroyo Grande 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 periwinkles and expect a good harvest is probably September. Any later than that and your periwinkles may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your periwinkles indoors.

Last Frost Date

The average date of last frost is February 15 in Arroyo Grande. You can expect an average low temperature of 25°F in the coldest months of winter.

Since the USDA zone info for Arroyo Grande is not always accurate the actual date of last frost changes from year to year. Since half of the time in Arroyo Grande you get a frost after February 15 be ready to cover your periwinkles if you have a surprise late frost.

USDA Zone Info for Arroyo Grande

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 Arroyo Grande

You may be interested in your other planting guides for Arroyo Grande.