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When to Plant Strawflowers in Riverton, WY

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.

A way of getting a good idea when it's possible to plant strawflowers is to use the USDA zone info for Riverton.


Planting Calendar for Strawflowers

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

Strawflowers do well in very little cold which means that you can plant them just a tiny bit earlier in the year than plants that are more sensitive to the cold.

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

The earliest that you can plant strawflowers in Riverton 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 strawflowers and expect a good harvest is probably August. You probably don't want to wait any later than that or else your strawflowers may not have a chance to really do well. If you are starting your strawflowers indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on May 15 in Riverton. In the coldest months of winter you should expect an average low temperature of -25°F.

Since the USDA zone info for Riverton is not always accurate the actual date of last frost can change quite a bit from year to year. Half of the time in Riverton you get surprised by a frost after May 15 so always be ready to protect your strawflowers in the event of one of those late frosts.

USDA Zone Info for Riverton

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 Riverton

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