When to Plant Periwinkles in Zone 1a

One of the best tools that you have as gardeners to help us estimate 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.

One way of getting a good idea when you can plant periwinkles is to use the USDA zone info for Zone 1a.


Planting Calendar for Periwinkles

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

You really shouldn't plant periwinkles until after the last frost has passed because they do not do well in cold weather.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant periwinkles
Possibly ok, but a risky time to plant periwinkles
Probably not a good time to plant periwinkles

The earliest that you can plant periwinkles in Zone 1a is June. However, you really should wait until July if you don't want to take any chances.

The last month that you can plant periwinkles and expect a good harvest is probably July. If you wait any later than that and your periwinkles may not have a chance to grow to maturity. Starting your periwinkles indoors is a great way to get them started a few weeks earlier.

Last Frost Date

In Zone 1a the average date of last frost happens on June 15. It might get as low as -60°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Zone 1a is just an average and the actual date of last frost changes from year to year. Half of the time in Zone 1a you get a frost after June 15 so always be ready to protect your periwinkles in the event of a surprise late frost.

USDA Zone Info for Zone 1a

Here is the info for USDA Zone 1a.

Average Date of Last Frost (spring)June 15
Average Date of First Frost (fall)July 15
Lowest Expected Low-60°F
Highest Expected Low-55°F

This means that on a really cold year, the coldest it will get is -60°F. On most years you should be prepared to experience lows near -55°F.

Plants to Grow in Zone 1a

You may be interested in your other planting guides for Zone 1a.