When can I plant Rhubarb in Zone 6a

One of the first steps we take when we are getting a good idea 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 a good idea to determine when to plant rhubarb by reviewing the USDA zone info for Zone 6a.


Planting Calendar for Rhubarb

Frost tolerance for rhubarb: Tolerant of some frost.
When you should plant them: Up to 5 weeks before last frost.

Rhubarb are moderately cold tolerant which tells us that you can plant them earlier than plants that are more sensitive to the cold.

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

The earliest that you can plant rhubarb in Zone 6a 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 rhubarb and expect a good harvest is probably September. If you wait any later than that and your rhubarb may not have a chance to grow to maturity. Starting your rhubarb indoors is a great way to get them started a little bit earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Zone 6a. In the coldest months of winter we should expect an average low temperature of -10°F.

Since the USDA zone info for Zone 6a is an average our actual date of last frost changes from year to year. Since half of the time in Zone 6a last frost occurs after April 15 be ready to cover your rhubarb in the event of one of those late frosts.

USDA Zone Info for Zone 6a

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)April 15
Average Date of First Frost (fall)October 15
Lowest Expected Low-10°F
Highest Expected Low-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Zone 6a

You may be interested in our other planting guides for Zone 6a.