Frost dates for Laporte, IN
At Laporte, the median last spring frost (32°F) is Apr 19 and the median first fall frost is Oct 27, for a typical growing season of 191 days. For a 90% chance that the last frost has passed, wait until May 3. Nearby ZIP codes are in USDA hardiness zones 5b to 6b.
- Apr 19Last spring frost (median)50% chance of 32°F after this date
- May 3Safer planting date10% chance of 32°F after this date
- Oct 27First fall frost (median)50% chance of 32°F by this date
- 191 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 17 | Apr 30 | May 14 |
| 32°F | Apr 5 | Apr 19 | May 3 |
| 28°F | Mar 25 | Apr 7 | Apr 22 |
| 24°F | Mar 12 | Mar 29 | Apr 12 |
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 4 | Oct 16 | Oct 29 |
| 32°F | Oct 14 | Oct 27 | Nov 9 |
| 28°F | Oct 26 | Nov 7 | Nov 23 |
| 24°F | Nov 4 | Nov 17 | Dec 3 |
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 | 148 days | 168 days | 186 days |
| 32°F | 171 days | 191 days | 209 days |
| 28°F | 194 days | 213 days | 233 days |
| 24°F | 214 days | 234 days | 257 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 |
|---|---|---|---|
| 46350 | 6a | -10 to -5°F | 1 km |
| 46345 | 6a | -10 to -5°F | 9 km |
| 46371 | 6a | -10 to -5°F | 14 km |
| 46360 | 6a | -10 to -5°F | 14 km |
| 46346 | 5b | -15 to -10°F | 15 km |
| 46365 | 6a | -10 to -5°F | 15 km |
| 49117 | 6a | -10 to -5°F | 19 km |
| 49129 | 6b | -5 to 0°F | 23 km |
| 49128 | 6a | -10 to -5°F | 26 km |
| 49116 | 6b | -5 to 0°F | 27 km |
| 49115 | 6b | -5 to 0°F | 30 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 USC00124837, at 41.6117, -86.7297, elevation 247 m (809 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 119.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Wanatah 2 WNW (25 km)
- Valparaiso Wtr Wks (28 km)
- Valparaiso Porter Co Muni Airport (29 km)
- Indiana Dunes Nl (30 km)
- Knox Wastewater Plant (35 km)
- South Bend Michiana Regional Airport (36 km)
- Lakeville (39 km)
- S Bend (41 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.