When to Plant Basil in Highland Park, IL

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

You can determine when you can plant basil in Highland Park by reviewing the USDA zone info.

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Planting Calendar for Basil

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

It's not a good idea to plant basil until after all chance of frost has passed because they require warm weather.

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

The earliest that you can plant basil in Highland Park 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 basil and expect a good harvest is probably August. You probably don't want to wait any later than that or else your basil may not have a chance to really do well. You can get started a few weeks earlier by starting your basil indoors.

Last Frost Date

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

Remember that USDA zone info for Highland Park is an average and the actual date of last frost can change quite a bit from year to year. Since half of the time in Highland Park it frosts late in the year after April 15 be ready to protect your basil in the event of a surprise late frost.

USDA Zone Info for Highland Park

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 Highland Park

You may be interested in your other planting guides for Highland Park.