Iowa frost dates: G
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Galt | Apr 30 | Oct 10 | 163 d | 5a |
| Galva | Apr 30 | Oct 9 | 162 d | 5a |
| Garber | Apr 21 | Oct 18 | 180 d | 5a |
| Garden City | Apr 24 | Oct 12 | 171 d | 5a |
| Garden Grove | Apr 30 | Oct 8 | 161 d | 5b |
| Garnavillo | Apr 21 | Oct 18 | 180 d | 5a |
| Garner | Apr 29 | Oct 7 | 161 d | 5a |
| Garrison | May 3 | Oct 3 | 153 d | 5a |
| Garwin | Apr 30 | Oct 9 | 162 d | 5a |
| Geneva | Apr 29 | Oct 9 | 163 d | 5a |
| George | May 1 | Oct 4 | 156 d | 5a |
| Gibson | Apr 24 | Oct 15 | 174 d | 5b |
| Gifford | Apr 27 | Oct 10 | 166 d | 5a |
| Gilbert | Apr 26 | Oct 8 | 165 d | 5b |
| Gilbertville | Apr 27 | Oct 10 | 166 d | 5a |
| Gillett Grove | Apr 30 | Oct 5 | 158 d | 5a |
| Gilman | Apr 28 | Oct 7 | 162 d | 5a |
| Gilmore City | Apr 27 | Oct 9 | 165 d | 5a |
| Gladbrook | Apr 30 | Oct 6 | 159 d | 5a |
| Glenwood | Apr 23 | Oct 11 | 171 d | 6a |
| Glidden | Apr 27 | Oct 10 | 166 d | 5a |
| Goldfield | Apr 30 | Oct 10 | 163 d | 5a |
| Goodell | Apr 29 | Oct 7 | 161 d | 5a |
| Goose Lake | Apr 13 | Oct 26 | 196 d | 5a |
| Gowrie | Apr 26 | Oct 10 | 167 d | 5a |
| Graettinger | Apr 27 | Oct 7 | 163 d | 5a |
| Grafton | May 4 | Oct 4 | 153 d | 5a |
| Grand Junction | Apr 26 | Oct 9 | 166 d | 5a |
| Grand Mound | Apr 27 | Oct 10 | 166 d | 5a |
| Grand River | Apr 23 | Oct 17 | 177 d | 5b |
| Grandview | Apr 26 | Oct 10 | 167 d | 5b |
| Granger | Apr 19 | Oct 18 | 182 d | 5b |
| Grant | Apr 27 | Oct 12 | 168 d | 5b |
| Granville | Apr 30 | Oct 3 | 156 d | 5a |
| Gravity | Apr 24 | Oct 15 | 174 d | 5b |
| Gray | May 2 | Oct 3 | 154 d | 5a |
| Greeley | May 3 | Oct 4 | 154 d | 4b |
| Greene | Apr 27 | Oct 8 | 164 d | 5a |
| Greenfield | Apr 25 | Oct 12 | 170 d | 5b |
| Greenville | Apr 30 | Oct 5 | 158 d | 5a |
| Grimes | Apr 19 | Oct 18 | 182 d | 5b |
| Grinnell | May 3 | Oct 6 | 156 d | 5b |
| Griswold | Apr 23 | Oct 14 | 174 d | 5b |
| Grundy Center | Apr 29 | Oct 9 | 163 d | 5a |
| Guernsey | Apr 28 | Oct 10 | 165 d | 5b |
| Guthrie Center | May 2 | Oct 3 | 154 d | 5a |
| Guttenberg | Apr 21 | Oct 18 | 180 d | 5a |