One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You can figure out when you can plant periwinkles in Archbold by using the USDA zone info.

Planting Calendar for Periwinkles

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

Since periwinkles are not cold tolerant you have to wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant periwinkles in Archbold 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. You probably don't want to wait any later than that or else your periwinkles may not have a chance to really do well. If you are starting your periwinkles indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Archbold. You should expect an average low temperature of -10°F in the coldest months of winter.

Since the USDA zone info for Archbold may not be accurate from year to year the actual date of last frost is different every year. Since half of the time in Archbold there is a last frost after April 15 be ready to protect your periwinkles if you have a surprise late frost.

USDA Zone Info for Archbold

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Archbold

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