When can I plant Nemesia in Alton, IL

One of the first steps we take when we are making a decision about our gardening schedule is find our USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for our area.

In Alton you can determine when to plant nemesia by referring to the USDA zone info.


Planting Calendar for Nemesia

Frost tolerance for nemesia: Not tolerant of frost.
When you should plant them: After the last frost.

Since nemesia require warm weather you must wait until after all chance of frost has passed before you can plant them.

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

The earliest that you can plant nemesia in Alton 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 nemesia and expect a good harvest is probably August. You probably don't want to wait any later than that or else your nemesia may not have a chance to fully mature. If you are starting your nemesia indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

On average all chance of frost has passed is on April 15 in Alton. It might get as low as -10°F during the coldest months of winter.

Just be sure to remember that our actual date of last frost is just an average because it is based on the USDA zone info for Alton and it will vary from year to year. Since half of the time in Alton it frosts late in the year after April 15 be ready to protect your nemesia if we have 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 our other planting guides for Alton.