Frost dates in Portis, KS
The average last spring frost in Portis is around April 22 and the first fall frost is around October 9. That gives Portis an average growing season of about 170 days.
Last spring frost
| Early (10% chance after) | February 28 |
|---|---|
| Average (50%) | April 22 |
| Late (90%) | May 13 |
First fall frost
| Early (10%) | September 29 |
|---|---|
| Average (50%) | October 9 |
| Late (90% chance before) | October 23 |