Frost dates for Mount Vernon, IN
At Mount Vernon, the median last spring frost (32°F) is Apr 7 and the median first fall frost is Oct 28, for a typical growing season of 202 days. For a 90% chance that the last frost has passed, wait until Apr 27. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 7Last spring frost (median)50% chance of 32°F after this date
- Apr 27Safer planting date10% chance of 32°F after this date
- Oct 28First fall frost (median)50% chance of 32°F by this date
- 202 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 5 | Apr 21 | May 7 |
| 32°F | Mar 25 | Apr 7 | Apr 27 |
| 28°F | Mar 12 | Mar 30 | Apr 14 |
| 24°F | Feb 28 | Mar 17 | Apr 2 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Oct 1 | Oct 17 | Oct 30 |
| 32°F | Oct 10 | Oct 28 | Nov 10 |
| 28°F | Oct 24 | Nov 7 | Nov 25 |
| 24°F | Nov 5 | Nov 20 | Dec 7 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 157 days | 177 days | 199 days |
| 32°F | 177 days | 202 days | 222 days |
| 28°F | 200 days | 224 days | 247 days |
| 24°F | 224 days | 248 days | 274 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 47620 | 7a | 0 to 5°F | 1 km |
| 47638 | 7a | 0 to 5°F | 18 km |
| 47631 | 7a | 0 to 5°F | 20 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00126001, at 37.9286, -87.8956, elevation 109 m (357 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 86.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Jt Myers Locks & Dam (17 km)
- Evansville Museum (29 km)
- Evansville Regional Airport (35 km)
- Newburgh L&d (46 km)
- Princeton 1 W (55 km)
- Boonville 1s (56 km)
- Stendal (74 km)
- Petersburg 61 Brg (81 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.