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When to Plant Sweet Sultan in Willowbrook, IL

One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You should be able to figure out when to plant sweet sultan by using the USDA zone info for Willowbrook.


Planting Calendar for Sweet Sultan

Frost tolerance for sweet sultan: Tolerant of a very small amount of frost.
When to plant: Up to 3 weeks before last frost.

Sweet Sultan can survive in very little cold which means that you can plant them slightly earlier in the year than more sensitive plants.

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

The earliest that you can plant sweet sultan in Willowbrook is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant sweet sultan and expect a good harvest is probably August. You probably don't want to wait any later than that or else your sweet sultan may not have a chance to grow to maturity. If you are starting your sweet sultan indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

In Willowbrook the average date of last frost happens on April 15. You can expect an average low temperature of -15°F in the coldest months of winter.

It's important to remember that USDA zone info for Willowbrook may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Since half of the time in Willowbrook last frost occurs after April 15 be ready to cover your sweet sultan in the event of a surprise late frost.

USDA Zone Info for Willowbrook

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 Willowbrook

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