When to Plant Calliopsis in Royersford, PA

Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The earliest that you can plant calliopsis in Royersford can be determined by referring to the USDA zone info.


Planting Calendar for Calliopsis

Frost tolerance for calliopsis: Not tolerant of frost.
When to plant: After all chance of frost has passed.

It's a bad idea to plant calliopsis until after the last frost has passed because they are not cold tolerant.

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

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

Last Frost Date

On average the last frost is on April 15 in Royersford. It might get as low as -5°F during the coldest months of winter.

Keep in mind that USDA zone info for Royersford is an average and the actual date of last frost changes from year to year. Half of the time in Royersford there is a last frost after April 15 so make sure that you are prepared to protect your calliopsis in the event of one of those late frosts.

USDA Zone Info for Royersford

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)April 15
Average Date of First Frost (fall)October 15
Lowest Expected Low-5°F
Highest Expected Low0°F

This means that on a really cold year, the coldest it will get is -5°F. On most years you should be prepared to experience lows near 0°F.

Plants to Grow in Royersford

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