When can I plant Zinnia in Zone 5a

The USDA Zone info is a great tool for gardeners to help us figure out our gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for our area.

A way of determining when it's possible to plant zinnia is to refer to the USDA zone info for Zone 5a.


Planting Calendar for Zinnia

Frost tolerance for zinnia: Not tolerant of frost.
When you should plant them: After the last frost when the weather gets warmer.

It's not a good idea to plant zinnia until after the last frost because they require warm weather.

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

The earliest that you can plant zinnia in Zone 5a 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 zinnia and expect a good harvest is probably August. Any later than that and your zinnia may not have a chance to fully mature. If you are starting your zinnia indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Zone 5a. In the coldest months of winter we should expect an average low temperature of -20°F.

Just be sure to remember that our actual date of last frost is not always accurate because it is based on the USDA zone info for Zone 5a and it will vary from year to year. Since half of the time in Zone 5a it frosts late in the year after April 15 be ready to protect your zinnia if we have one of those late frosts.

USDA Zone Info for Zone 5a

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)April 15
Average Date of First Frost (fall)October 15
Lowest Expected Low-20°F
Highest Expected Low-15°F

This means that on a really cold year, the coldest it will get is -20°F. On most years you should be prepared to experience lows near -15°F.

Plants to Grow in Zone 5a

You may be interested in our other planting guides for Zone 5a.