When can I plant Primula in Zone 5b

One of the best tools that we have as gardeners to help us figure out our gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for our area.

One way of getting a good idea when to plant primula is to consult the USDA zone info for Zone 5b.


Planting Calendar for Primula

Frost tolerance for primula: Very tolerant of frost.
When you should plant them: Up to 7 weeks before last frost.

Primula do ok in cold weather which means that you can plant them much earlier in the year than more sensitive plants.

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

The earliest that you can plant primula in Zone 5b is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant primula and expect a good harvest is probably September. You probably don't want to wait any later than that or else your primula may not have a chance to fully mature. You can get started a little bit earlier by starting your primula indoors.

Last Frost Date

In Zone 5b the average date of last frost happens on April 15. In the coldest months of winter we should 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 will vary from year to year. Since half of the time in Zone 5b we get surprised by a frost after April 15 be ready to cover your primula if we have one of those late frosts.

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.