When can I plant Pearl onions in Zone 1b

Before planting it is a good idea to find our USDA Zone info to figure out our garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for our area.

You will be able to determine when you can plant pearl onions by referring to the USDA zone info for Zone 1b.


Planting Calendar for Pearl onions

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

Pearl onions can survive in very little cold which tells us that you can plant them a bit earlier in the year than other frost tender plants.

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

The earliest that you can plant pearl onions in Zone 1b is June. However, you really should wait until July if you don't want to take any chances.

The last month that you can plant pearl onions and expect a good harvest is probably July. If you wait any later than that and your pearl onions may not have a chance to fully mature. Starting your pearl onions indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost has passed is on June 15 in Zone 1b. We can expect an average low temperature of -55°F in the coldest months of winter.

It's important to remember that our actual date of last frost is just an average because it is based on the USDA zone info for Zone 1b and it can change quite a bit from year to year. Since half of the time in Zone 1b we get surprised by a frost after June 15 be ready to cover your pearl onions in the event of a late frost.

USDA Zone Info for Zone 1b

Here is the info for USDA Zone 1b.

Average Date of Last Frost (spring)June 15
Average Date of First Frost (fall)July 15
Lowest Expected Low-55°F
Highest Expected Low-50°F

This means that on a really cold year, the coldest it will get is -55°F. On most years you should be prepared to experience lows near -50°F.

Plants to Grow in Zone 1b

You may be interested in our other planting guides for Zone 1b.