| City | Population | Last spring frost | First fall frost | Growing season | Zone |
|---|---|---|---|---|---|
| Portland | 635,109 | Feb 25 | Dec 1 | 280 days | 8b |
| Salem | 181,779 | Apr 3 | Nov 1 | 212 days | 8b |
| Eugene | 178,618 | Apr 11 | Oct 23 | 196 days | 8b |
| Gresham | 111,513 | Mar 16 | Nov 20 | 250 days | 9a |
| Hillsboro | 111,126 | Apr 16 | Oct 23 | 191 days | 8b |
| Bend | 107,342 | Jun 6 | Sep 20 | 105 days | 6b |
| Beaverton | 97,842 | Apr 1 | Nov 6 | 222 days | 9a |
| Medford | 86,494 | Apr 8 | Oct 29 | 204 days | 8b |
| Corvallis | 61,499 | Apr 17 | Oct 28 | 194 days | 8b |
| Springfield | 61,431 | Apr 11 | Oct 23 | 196 days | 8b |
| Tigard | 57,929 | Apr 1 | Nov 6 | 222 days | 9a |
| Albany | 56,894 | Apr 17 | Oct 28 | 194 days | 8b |
| Lake Oswego | 39,722 | Mar 18 | Nov 18 | 244 days | 9a |
| Grants Pass | 39,239 | Apr 8 | Oct 28 | 201 days | 8b |
| Keizer | 39,140 | Apr 3 | Nov 1 | 212 days | 8b |
| Redmond | 38,547 | Jun 9 | Sep 14 | 98 days | 6b |
| Oregon City | 38,175 | Mar 18 | Nov 18 | 244 days | 9a |
| McMinnville | 34,647 | Apr 5 | Nov 7 | 216 days | 8b |
| Woodburn | 31,948 | Mar 16 | Nov 14 | 242 days | 8b |
| Happy Valley | 28,916 | Mar 18 | Nov 18 | 244 days | 8b |
| Tualatin | 28,139 | Apr 1 | Nov 6 | 222 days | 9a |
| Wilsonville | 27,833 | Mar 18 | Nov 13 | 243 days | 8b |
| Forest Grove | 27,252 | Apr 16 | Oct 26 | 192 days | 8b |
| Newberg | 26,896 | Mar 21 | Nov 22 | 241 days | 8b |
| West Linn | 26,567 | Mar 18 | Nov 18 | 244 days | 9a |
| Roseburg | 23,693 | Mar 23 | Nov 18 | 237 days | 8b |
| Milwaukie | 22,114 | Feb 25 | Dec 1 | 280 days | 9a |
| Klamath Falls | 22,111 | Jun 9 | Sep 18 | 99 days | 6b |
| Ashland | 20,889 | May 6 | Oct 8 | 154 days | 8a |
| Sherwood | 20,535 | Mar 21 | Nov 22 | 241 days | 8b |
| Lebanon | 20,267 | Mar 14 | Nov 18 | 248 days | 8b |
| Hermiston | 19,906 | Apr 26 | Oct 10 | 167 days | 7b |
| Central Point | 19,139 | Apr 8 | Oct 29 | 204 days | 8b |
| Canby | 18,004 | Mar 18 | Nov 13 | 243 days | 8b |
| Dallas | 17,890 | Apr 16 | Nov 1 | 199 days | 8b |
| Pendleton | 16,989 | Apr 22 | Oct 9 | 170 days | 7a |
| Troutdale | 15,776 | Mar 26 | Nov 17 | 237 days | 9a |
| The Dalles | 15,745 | Apr 11 | Oct 26 | 197 days | 8a |
| Coos Bay | 15,686 | Feb 21 | Dec 9 | 294 days | 9a |
| Cornelius | 15,520 | Apr 16 | Oct 26 | 192 days | 8b |
| St. Helens | 14,450 | Apr 18 | Nov 7 | 201 days | 8b |
| Sandy | 13,323 | Mar 27 | Nov 18 | 239 days | 8b |
| La Grande | 12,985 | May 6 | Oct 1 | 146 days | 6b |
| Prineville | 11,994 | Jun 1 | Sep 22 | 113 days | 6b |
| Ontario | 11,957 | Apr 22 | Oct 9 | 168 days | 7a |
| Gladstone | 11,865 | Mar 18 | Nov 18 | 244 days | 9a |
| Monmouth | 11,543 | Apr 16 | Nov 1 | 199 days | 8b |
| Cottage Grove | 10,851 | Apr 24 | Oct 25 | 183 days | 8b |
| Fairview | 10,762 | Mar 16 | Nov 20 | 250 days | 9a |
| Silverton | 10,450 | Mar 28 | Nov 10 | 227 days | 8b |
| Newport | 10,383 | Feb 19 | Dec 16 | 306 days | 9b |
| Sweet Home | 10,308 | Apr 12 | Oct 28 | 197 days | 8b |
| Independence | 10,195 | Apr 16 | Nov 1 | 199 days | 8b |
| Lincoln City | 10,117 | Apr 4 | Nov 16 | 227 days | 9a |
| Molalla | 10,104 | Mar 16 | Nov 19 | 247 days | 8b |
| Baker City | 10,071 | May 25 | Sep 15 | 111 days | 6b |
| North Bend | 9,966 | Feb 21 | Dec 9 | 294 days | 9a |
| Eagle Point | 9,861 | Apr 8 | Oct 29 | 204 days | 8a |
| Astoria | 9,838 | Mar 26 | Nov 11 | 232 days | 9a |
| Florence | 9,468 | Apr 10 | Nov 15 | 220 days | 9a |
| Sutherlin | 8,635 | Mar 31 | Nov 5 | 215 days | 8b |
| Stayton | 8,488 | Mar 29 | Nov 6 | 222 days | 8b |
| Hood River | 8,315 | Apr 20 | Oct 13 | 177 days | 8a |
| Scappoose | 8,257 | Apr 10 | Nov 2 | 209 days | 8b |
| Umatilla | 8,220 | Mar 30 | Nov 4 | 217 days | 7b |
| Madras | 7,829 | May 19 | Oct 4 | 136 days | 7a |
| Junction City | 7,224 | Apr 11 | Oct 23 | 196 days | 8b |
| Seaside | 7,092 | Apr 2 | Nov 12 | 223 days | 9a |
| Milton-Freewater | 7,029 | Mar 25 | Oct 29 | 218 days | 7a |
| Brookings | 6,431 | Jan 31 | Dec 27 | 349 days | 9b |
| Warrenton | 6,312 | Mar 26 | Nov 11 | 232 days | 9a |
| Talent | 6,296 | May 6 | Oct 8 | 154 days | 8b |
| Sheridan | 6,243 | Apr 16 | Nov 1 | 199 days | 8b |
| Estacada | 5,814 | Mar 27 | Nov 14 | 230 days | 8b |
| Philomath | 5,699 | May 15 | Oct 8 | 145 days | 8b |
| Winston | 5,680 | Mar 23 | Nov 18 | 237 days | 9a |
| Creswell | 5,566 | Apr 24 | Oct 25 | 183 days | 8b |
| Tillamook | 5,162 | Apr 22 | Oct 21 | 183 days | 9a |
| Veneta | 5,138 | Apr 18 | Oct 25 | 189 days | 8b |
| King City | 5,044 | Apr 1 | Nov 6 | 222 days | 9a |