When to Plant Heliotrope in Stillwater, MN

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

In Stillwater you can estimate when you can plant heliotrope by reviewing the USDA zone info.

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Planting Calendar for Heliotrope

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

Heliotrope do not do well in cold weather which means that it is necessary to wait until it warms up after all chance of frost has passed before you can plant them.

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

The earliest that you can plant heliotrope in Stillwater 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 heliotrope and expect a good harvest is probably August. Any later than that and your heliotrope may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your heliotrope indoors.

Last Frost Date

On average the last frost has passed is on May 15 in Stillwater. You should expect an average low temperature of -25°F in the coldest months of winter.

It's important to remember that USDA zone info for Stillwater is an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Stillwater it frosts late in the year after May 15 so just be sure to be ready to protect your heliotrope if you have one of those late frosts.

USDA Zone Info for Stillwater

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)September 15
Lowest Expected Low-25°F
Highest Expected Low-20°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 -20°F.

Plants to Grow in Stillwater

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