Arkansas frost dates: O
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| O Kean | Mar 31 | Nov 1 | 215 d | 7b |
| Oak Grove | Apr 8 | Nov 2 | 208 d | 7a |
| Oakland | Apr 2 | Nov 1 | 213 d | 7a |
| Oark | Mar 25 | Nov 10 | 230 d | 7b |
| Oden | Apr 8 | Oct 26 | 201 d | 8a |
| Ogden | Mar 24 | Nov 11 | 232 d | 8b |
| Oil Trough | Mar 18 | Nov 11 | 238 d | 8a |
| Okolona | Mar 26 | Nov 4 | 223 d | 8a |
| Ola | Mar 22 | Nov 11 | 234 d | 8a |
| Omaha | Apr 8 | Nov 2 | 208 d | 7a |
| Oneida | Mar 15 | Nov 16 | 246 d | 8a |
| Onia | Apr 2 | Oct 31 | 212 d | 7b |
| Osceola | Mar 23 | Nov 6 | 228 d | 8a |
| Oxford | Apr 8 | Oct 30 | 205 d | 7b |
| Ozan | Mar 26 | Nov 9 | 228 d | 8a |
| Ozark | Mar 30 | Nov 6 | 221 d | 7b |
| Ozone | Mar 25 | Nov 10 | 230 d | 7b |