Frost dates in Sinai, SD
The average last spring frost in Sinai is around May 4 and the first fall frost is around September 28. That gives Sinai an average growing season of about 147 days.
Last spring frost
| Early (10% chance after) | April 21 |
|---|---|
| Average (50%) | May 4 |
| Late (90%) | May 20 |
First fall frost
| Early (10%) | September 22 |
|---|---|
| Average (50%) | September 28 |
| Late (90% chance before) | October 15 |