Last frost dates in Ohio
130 NOAA weather stations in Ohio have thirty years of frost records. The median station sees its last 32 °F night around Apr 24; across the state that ranges from Apr 8 to May 10, so pick the station nearest you rather than a state-wide figure.
| CLEVELAND BURKE AP | Apr 8 | Apr 20 | Mar 29 | Nov 12 | 217 |
| SANDUSKY | Apr 10 | Apr 23 | Mar 31 | Nov 5 | 209 |
| CINCINNATI-FERNBANK | Apr 13 | May 2 | Mar 31 | Oct 31 | 197 |
| PAINESVILLE 4 NW | Apr 15 | Apr 27 | Apr 2 | Nov 9 | 209 |
| CHEVIOT 3 W | Apr 16 | May 3 | Apr 2 | Oct 28 | 193 |
| CHILO MELDAHL LOCKS & DAM | Apr 16 | May 4 | Apr 2 | Oct 31 | 196 |
| CINCINNATI LUNKEN AP | Apr 16 | May 3 | Apr 2 | Oct 25 | 190 |
| DAYTON INTL AP | Apr 16 | May 3 | Apr 2 | Oct 28 | 194 |
| S PT | Apr 16 | May 4 | Apr 2 | Oct 30 | 196 |
| CHEVIOT | Apr 17 | May 5 | Apr 2 | Oct 26 | 191 |
| CIRCLEVILLE | Apr 17 | May 4 | Apr 2 | Oct 28 | 192 |
| DAYTON WRIGHT BROS AP | Apr 17 | May 6 | Apr 3 | Oct 26 | 192 |
| PORTSMOUTH-SCIOTOVILLE | Apr 17 | May 5 | Apr 3 | Oct 25 | 191 |
| WFO WILMINGTON | Apr 17 | May 4 | Apr 3 | Oct 22 | 187 |
| COLUMBUS PORT COLUMBUS INTL AP | Apr 18 | May 5 | Apr 4 | Oct 27 | 191 |
| COSHOCTON AG RSCH STN | Apr 18 | May 5 | Apr 4 | Oct 28 | 190 |
| DAYTON MCD | Apr 18 | May 5 | Apr 3 | Oct 25 | 189 |
| GALLIPOLIS | Apr 18 | May 4 | Apr 3 | Oct 28 | 192 |
| MARIETTA WWTP | Apr 18 | May 4 | Apr 5 | Oct 27 | 191 |
| PIQUA WWTP | Apr 18 | May 5 | Apr 5 | Oct 23 | 186 |
| XENIA 6 SSE | Apr 18 | May 4 | Apr 3 | Oct 24 | 188 |
| BUCYRUS | Apr 19 | May 6 | Apr 5 | Oct 27 | 190 |
| CINCINNATI | Apr 19 | May 6 | Apr 5 | Oct 22 | 185 |
| FAIRFIELD | Apr 19 | May 7 | Apr 2 | Oct 22 | 186 |
| FINDLAY AP | Apr 19 | May 6 | Apr 5 | Oct 23 | 185 |
| MARYSVILLE | Apr 19 | May 5 | Apr 5 | Oct 26 | 188 |
| PHILO 3 SW | Apr 19 | May 9 | Apr 2 | Oct 25 | 189 |
| CHILLICOTHE MOUND CITY | Apr 20 | May 7 | Apr 6 | Oct 22 | 184 |
| CLEVELAND | Apr 20 | May 5 | Apr 4 | Nov 3 | 198 |
| COLUMBUS WCMH | Apr 20 | May 7 | Apr 5 | Oct 24 | 185 |
| TOLEDO METCALF FLD | Apr 20 | May 7 | Apr 5 | Oct 27 | 188 |
| WILMINGTON 3 N | Apr 20 | May 6 | Apr 6 | Oct 20 | 180 |
| CADIZ | Apr 21 | May 5 | Apr 6 | Oct 25 | 186 |
| FREMONT AG STN | Apr 21 | May 6 | Apr 8 | Oct 24 | 183 |
| GREENVILLE WTP | Apr 21 | May 7 | Apr 7 | Oct 20 | 180 |
| LUCASVILLE | Apr 21 | May 9 | Apr 6 | Oct 24 | 185 |
| RAVENNA 2 S | Apr 21 | May 7 | Apr 8 | Oct 29 | 189 |
| VAN WERT 1 S | Apr 21 | May 6 | Apr 7 | Oct 26 | 187 |
| WAVERLY | Apr 21 | May 9 | Apr 4 | Oct 22 | 182 |
| BOWLING GREEN WWTP | Apr 22 | May 7 | Apr 8 | Oct 25 | 186 |
| COLUMBUS OHIO STATE UNIV AP | Apr 22 | May 9 | Apr 6 | Oct 23 | 183 |
| DEFIANCE | Apr 22 | May 8 | Apr 10 | Oct 24 | 183 |
| ELYRIA 3 E | Apr 22 | May 7 | Apr 6 | Nov 1 | 192 |
| FINDLAY WPCC | Apr 22 | May 6 | Apr 9 | Oct 24 | 183 |
| HAMILTON BUTLER CO RGNL AP | Apr 22 | May 10 | Apr 6 | Oct 18 | 178 |
| HUNTSVILLE 3N | Apr 22 | May 6 | Apr 8 | Oct 27 | 188 |
| JACKSON 3 NW | Apr 22 | May 11 | Apr 7 | Oct 21 | 181 |
| KENTON | Apr 22 | May 7 | Apr 9 | Oct 24 | 182 |
| LANCASTER | Apr 22 | May 9 | Apr 7 | Oct 24 | 183 |
| LIMA ALLEN CO AP | Apr 22 | May 7 | Apr 7 | Oct 22 | 181 |
| NEWARK HEATH AP | Apr 22 | May 10 | Apr 6 | Oct 18 | 178 |
| TOLEDO EXPRESS AP | Apr 22 | May 7 | Apr 6 | Oct 24 | 188 |
| WESTERVILLE | Apr 22 | May 10 | Apr 9 | Oct 24 | 183 |
| COLUMBUS-VALLEY CROSSING | Apr 23 | May 8 | Apr 11 | Oct 19 | 177 |
| MILFORD | Apr 23 | May 8 | Apr 9 | Oct 18 | 177 |
| NAPOLEON 1SW | Apr 23 | May 9 | Apr 8 | Oct 24 | 183 |
| NEWPORT | Apr 23 | May 10 | Apr 10 | Oct 26 | 185 |
| PANDORA | Apr 23 | May 9 | Apr 10 | Oct 22 | 180 |
| TIFFIN | Apr 23 | May 7 | Apr 8 | Oct 23 | 184 |
| WASHINGTON COURT HOUSE | Apr 23 | May 8 | Apr 10 | Oct 21 | 181 |
| AKRON CANTON RGNL AP | Apr 24 | May 11 | Apr 10 | Oct 26 | 184 |
| AKRON FULTON INTL AP | Apr 24 | May 9 | Apr 10 | Oct 28 | 186 |
| BEVERLY STP | Apr 24 | May 11 | Apr 11 | Oct 22 | 178 |
| ELYRIA LORAIN CO AP | Apr 24 | May 10 | Apr 9 | Oct 24 | 182 |
| FRANKLIN | Apr 24 | May 11 | Apr 9 | Oct 19 | 178 |
| HILLSBORO | Apr 24 | May 11 | Apr 10 | Oct 20 | 178 |
| HOYTVILLE 2 NE | Apr 24 | May 10 | Apr 11 | Oct 21 | 179 |
| LIMA WWTP | Apr 24 | May 11 | Apr 12 | Oct 24 | 182 |
| LONDON FISH HATCHERY | Apr 24 | May 10 | Apr 10 | Oct 18 | 175 |
| MARION MUNI AP | Apr 24 | May 10 | Apr 11 | Oct 20 | 178 |
| NAPOLEON | Apr 24 | May 7 | Apr 13 | Oct 21 | 179 |
| NEW CARLISLE | Apr 24 | May 10 | Apr 10 | Oct 17 | 173 |
| URBANA WWTP | Apr 24 | May 10 | Apr 10 | Oct 19 | 179 |
| WOOSTER 3 SSE | Apr 24 | May 12 | Apr 10 | Oct 21 | 177 |
| ATHENS OU | Apr 25 | May 12 | Apr 11 | Oct 23 | 179 |
| EATON | Apr 25 | May 10 | Apr 11 | Oct 20 | 176 |
| MARION 2 N | Apr 25 | May 11 | Apr 11 | Oct 20 | 178 |
| NORWALK WWTP | Apr 25 | May 9 | Apr 11 | Oct 25 | 183 |
| PAULDING | Apr 25 | May 10 | Apr 11 | Oct 19 | 175 |
| SPRINGFIELD WTP | Apr 25 | May 12 | Apr 12 | Oct 19 | 175 |
| BELLEFONTAINE | Apr 26 | May 12 | Apr 12 | Oct 20 | 175 |
| BRYAN 2 SE | Apr 26 | May 11 | Apr 14 | Oct 17 | 170 |
| FREMONT | Apr 26 | May 13 | Apr 11 | Oct 23 | 179 |
| GALION WTR WKS | Apr 26 | May 11 | Apr 11 | Oct 20 | 176 |
| HANNIBAL LOCKS & DAM | Apr 26 | May 13 | Apr 13 | Oct 26 | 182 |
| KIRTLAND-HOLDEN 2 | Apr 26 | May 14 | Apr 11 | Oct 31 | 184 |
| LANCASTER FAIRFIELD AP | Apr 26 | May 12 | Apr 12 | Oct 13 | 169 |
| MANSFIELD LAHM MUNI AP | Apr 26 | May 12 | Apr 14 | Oct 22 | 177 |
| NEW PHILADELPHIA FLD | Apr 26 | May 15 | Apr 14 | Oct 21 | 176 |
| ZANESVILLE MUNI AP | Apr 26 | May 14 | Apr 11 | Oct 19 | 177 |
| BARNESVILLE | Apr 27 | May 13 | Apr 14 | Oct 22 | 177 |
| CARPENTER 2 S | Apr 27 | May 15 | Apr 11 | Oct 14 | 168 |
| CELINA 3 NE | Apr 27 | May 10 | Apr 12 | Oct 19 | 175 |
| CENTERBURG 2 SE | Apr 27 | May 13 | Apr 13 | Oct 17 | 172 |
| COSHOCTON WPC PLT | Apr 27 | May 16 | Apr 13 | Oct 18 | 174 |
| MC CONNELLSVILLE LK 7 | Apr 27 | May 14 | Apr 13 | Oct 21 | 176 |
| OBERLIN | Apr 27 | May 14 | Apr 13 | Oct 22 | 178 |
| SIDNEY 1 S | Apr 27 | May 12 | Apr 12 | Oct 20 | 175 |
| CAMBRIDGE | Apr 28 | May 15 | Apr 13 | Oct 17 | 172 |
| DEFIANCE MEM AP | Apr 28 | May 14 | Apr 13 | Oct 17 | 170 |
| HICKSVILLE | Apr 28 | May 13 | Apr 14 | Oct 17 | 170 |
| MONTPELIER | Apr 28 | May 12 | Apr 15 | Oct 18 | 173 |
| CHIPPEWA LAKE | Apr 29 | May 15 | Apr 15 | Oct 19 | 172 |
| DENNISON WTR WKS | Apr 29 | May 17 | Apr 17 | Oct 15 | 170 |
| NEWARK WTR WKS | Apr 29 | May 17 | Apr 17 | Oct 16 | 167 |
| RIPLEY EXP FARM | Apr 29 | May 16 | Apr 17 | Oct 11 | 162 |
| STEUBENVILLE | Apr 29 | May 15 | Apr 16 | Oct 20 | 175 |
| UPPER SANDUSKY | Apr 29 | May 14 | Apr 13 | Oct 17 | 171 |
| WAUSEON WTP | Apr 29 | May 16 | Apr 14 | Oct 16 | 170 |
| WOOSTER WAYNE CO AP | Apr 29 | May 15 | Apr 15 | Oct 14 | 167 |
| ASHLAND 2 SW | Apr 30 | May 15 | Apr 16 | Oct 15 | 168 |
| CALDWELL 3SE | Apr 30 | May 20 | Apr 15 | Oct 14 | 167 |
| LOGAN | Apr 30 | May 17 | Apr 18 | Oct 14 | 167 |
| MANSFIELD 5 W | Apr 30 | May 17 | Apr 16 | Oct 15 | 167 |
| MOSQUITO CREEK LAKE | Apr 30 | May 16 | Apr 16 | Oct 23 | 176 |
| NEW LEXINGTON 2 NW | Apr 30 | May 16 | Apr 17 | Oct 17 | 168 |
| NEW PHILADELPHIA | Apr 30 | May 17 | Apr 18 | Oct 15 | 167 |
| STOW 4 SE | Apr 30 | May 16 | Apr 17 | Oct 21 | 173 |
| WATERLOO | Apr 30 | May 16 | Apr 15 | Oct 15 | 167 |
| WOOSTER EXP STATION | Apr 30 | May 18 | Apr 17 | Oct 12 | 163 |
| FREDERICKTOWN 4 S | May 1 | May 18 | Apr 18 | Oct 10 | 161 |
| HIRAM | May 1 | May 18 | Apr 18 | Oct 20 | 170 |
| YOUNGSTOWN RGNL AP | May 1 | May 20 | Apr 16 | Oct 17 | 167 |
| ASHTABULA CO AP | May 2 | May 20 | Apr 18 | Oct 21 | 171 |
| DANVILLE 2 W | May 2 | May 19 | Apr 20 | Oct 8 | 157 |
| MILLERSBURG | May 2 | May 21 | Apr 18 | Oct 14 | 164 |
| MILLPORT 4 NE | May 2 | May 20 | Apr 18 | Oct 13 | 165 |
| CHARDON | May 5 | May 21 | Apr 22 | Oct 18 | 164 |
| WARREN 3 S | May 8 | May 25 | Apr 23 | Oct 12 | 157 |
| DORSET | May 10 | May 27 | Apr 25 | Oct 10 | 154 |
How to read the three dates
Average is the date by which, in half of the years between 1991 and 2020, the last 32 °F night had already happened. Safe is later: only one year in ten saw a frost after it, which is the date to set out frost-tender plants such as dahlia tubers and zinnia seedlings. Early is the risky end, with a frost after it in nine years out of ten.
Every figure is for the weather station, not for your garden. A valley bottom, a north slope or a spot near a lake can run a week or two either way. Cities are warmer than the countryside around them.
Where the numbers come from
The dates are NOAA's U.S. Climate Normals for 1991 to 2020, computed by the National Centers for Environmental Information for every station with thirty years of daily minimum temperatures. ZIP codes are matched to the nearest such station within 150 km using U.S. Census Bureau ZIP Code Tabulation Area centroids. Stations that never see a frost, such as much of south Florida, report no date and are left out.