When to Plant Scarlet Runner Beans in Zone 1a

Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The first chance to plant scarlet runner beans in Zone 1a can be figured out by using the USDA zone info.


Planting Calendar for Scarlet Runner Beans

Frost tolerance for scarlet runner beans: Not tolerant of frost.
When to plant: After the last frost has passed.

You really shouldn't plant scarlet runner beans until after the last frost because they require warm weather.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant scarlet runner beans
Possibly ok, but a risky time to plant scarlet runner beans
Probably not a good time to plant scarlet runner beans

The earliest that you can plant scarlet runner beans in Zone 1a 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 scarlet runner beans and expect a good harvest is probably July. If you wait any later than that and your scarlet runner beans may not have a chance to really do well. You can get started a couple of weeks earlier by starting your scarlet runner beans indoors.

Last Frost Date

The average date of last frost is June 15 in Zone 1a. It might get as low as -60°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Zone 1a is an average and the actual date of last frost changes from year to year. Since half of the time in Zone 1a you get a frost after June 15 be ready to cover your scarlet runner beans if you have one of those late frosts.

USDA Zone Info for Zone 1a

Here is the info for USDA Zone 1a.

Average Date of Last Frost (spring)June 15
Average Date of First Frost (fall)July 15
Lowest Expected Low-60°F
Highest Expected Low-55°F

This means that on a really cold year, the coldest it will get is -60°F. On most years you should be prepared to experience lows near -55°F.

Plants to Grow in Zone 1a

You may be interested in your other planting guides for Zone 1a.