When to Plant Lisianthus in Roscoe, IL

Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

It's possible to figure out when it's the best time to plant lisianthus by using the USDA zone info for Roscoe.

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Planting Calendar for Lisianthus

Frost tolerance for lisianthus: Not tolerant of frost.
When to plant: After all chance of frost has passed.

You can not plant lisianthus until after the last frost has passed because they require warm weather.

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

The earliest that you can plant lisianthus in Roscoe 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 lisianthus and expect a good harvest is probably August. You probably don't want to wait any later than that or else your lisianthus may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your lisianthus indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Roscoe. It might get as low as -15°F during the coldest months of winter.

Since the USDA zone info for Roscoe is not always accurate the actual date of last frost changes from year to year. Since half of the time in Roscoe you get a frost after April 15 be ready to protect your lisianthus in the event of a late frost.

USDA Zone Info for Roscoe

Here is the info for USDA Zone 5b.

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

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Roscoe

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