When can I plant Saxifraga in Zone 4b

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.

You can determine when you can plant saxifraga in Zone 4b by checking out the USDA zone info.


Planting Calendar for Saxifraga

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

Since saxifraga are one of those plants that can tolerate a tiny bit of cold weather you can plant them just a tiny bit earlier in the year than other plants that might not handle the cold.

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

The earliest that you can plant saxifraga in Zone 4b 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 saxifraga and expect a good harvest is probably August. Any later than that and your saxifraga may not have a chance to really do well. You can get started a little bit earlier by starting your saxifraga indoors.

Last Frost Date

The average date of last frost is May 15 in Zone 4b. In the coldest months of winter we should expect an average low temperature of -25°F.

Always keep in mind that USDA zone info for Zone 4b is an average and our actual date of last frost is different every year. Half of the time in Zone 4b there is a last frost after May 15 so make sure that you are prepared to cover your saxifraga in the event of a late frost.

USDA Zone Info for Zone 4b

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)September 15
Lowest Expected Low-25°F
Highest Expected Low-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Zone 4b

You may be interested in our other planting guides for Zone 4b.