When can I plant Fennel in Zone 3a

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

You should be able to estimate when to plant fennel by using the USDA zone info for Zone 3a.


Planting Calendar for Fennel

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

You can plant fennel earlier in the year because they are very cold tolerant.

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

The earliest that you can plant fennel in Zone 3a 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 fennel and expect a good harvest is probably August. Any later than that and your fennel may not have a chance to really do well. Starting your fennel indoors is a great way to get them started a few weeks earlier.

Last Frost Date

In Zone 3a the average date of last frost happens on May 15. We can expect an average low temperature of -40°F in the coldest months of winter.

Since the USDA zone info for Zone 3a is an average our actual date of last frost will vary from year to year. Half of the time in Zone 3a we get a frost after May 15 so just be sure to be ready to cover your fennel if we have one of those late frosts.

USDA Zone Info for Zone 3a

Here is the info for USDA Zone 3a.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)September 15
Lowest Expected Low-40°F
Highest Expected Low-35°F

This means that on a really cold year, the coldest it will get is -40°F. On most years you should be prepared to experience lows near -35°F.

Plants to Grow in Zone 3a

You may be interested in our other planting guides for Zone 3a.