When to Plant Sutera in Alton, IL

One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A way of estimating when you can plant sutera is to check out the USDA zone info for Alton.


Planting Calendar for Sutera

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

Since sutera do ok in moderate cold you can plant them just a tiny bit earlier in the year than plants that are more sensitive to the cold.

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

The earliest that you can plant sutera in Alton 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 sutera and expect a good harvest is probably August. If you wait any later than that and your sutera may not have a chance to grow to maturity. Starting your sutera indoors is a great way to get them started a little bit earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Alton. It might get as low as -10°F during 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 Alton and it is different every year. Half of the time in Alton it frosts late in the year after April 15 so just be sure to be ready to protect your sutera in the event of a late frost.

USDA Zone Info for Alton

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)April 15
Average Date of First Frost (fall)October 15
Lowest Expected Low-10°F
Highest Expected Low-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Alton

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