When can I plant Petunias in Zone 5b

One of the first steps we take when we are estimating our gardening schedule is find our USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for our area.

It's possible to figure out when it's a good idea to plant petunias by looking at the USDA zone info for Zone 5b.


Planting Calendar for Petunias

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

Petunias do ok in moderate cold which means that you can plant them slightly earlier than more sensitive plants.

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

The earliest that you can plant petunias in Zone 5b 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 petunias and expect a good harvest is probably August. You probably don't want to wait any later than that or else your petunias may not have a chance to fully mature. You can get started a few weeks earlier by starting your petunias indoors.

Last Frost Date

In Zone 5b the average date of last frost happens on April 15. In the coldest months of winter we can expect an average low temperature of -15°F.

Since the USDA zone info for Zone 5b may not be accurate from year to year our actual date of last frost can change quite a bit from year to year. Half of the time in Zone 5b we get a frost after April 15 so be sure to be ready to protect your petunias if we have a late frost.

USDA Zone Info for Zone 5b

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 Zone 5b

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