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

The best time to plant scarlet runner beans in Gaithersburg can be determined by checking out the USDA zone info.

Planting Calendar for Scarlet Runner Beans

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

Scarlet Runner Beans are not cold tolerant which means that you have to wait until it warms up after the last frost before you can plant them.

The earliest that you can plant scarlet runner beans in Gaithersburg 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 scarlet runner beans and expect a good harvest is probably August. If you wait any later than that and your scarlet runner beans may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your scarlet runner beans indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Gaithersburg. It might get as low as 0°F during the coldest months of winter.

Keep in mind that the actual date of last frost is just an average because it is based on the USDA zone info for Gaithersburg and it can change quite a bit from year to year. Since half of the time in Gaithersburg there is a last frost after April 15 be ready to cover your scarlet runner beans in the event of a surprise late frost.

USDA Zone Info for Gaithersburg

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Gaithersburg

You may be interested in your other planting guides for Gaithersburg.