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When to Plant Evolvulus in Williston, ND

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 estimate when it's the best time to plant evolvulus by checking out the USDA zone info for Williston.


Planting Calendar for Evolvulus

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

Evolvulus are not cold tolerant which means that you really should wait until it warms up after the last frost when the weather gets warmer before you can plant them.

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

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

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

Last Frost Date

On average all chance of frost has passed is on May 15 in Williston. You should expect an average low temperature of -30°F in the coldest months of winter.

It's important to remember that the actual date of last frost is not always accurate because it is based on the USDA zone info for Williston and it can change quite a bit from year to year. Since half of the time in Williston there is a last frost after May 15 be ready to protect your evolvulus in the event of a late frost.

USDA Zone Info for Williston

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)September 15
Lowest Expected Low-30°F
Highest Expected Low-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Williston

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