Frost dates / Indiana / Indianapolis city (balance)
Frost dates in Indianapolis city (balance), IN
The station on this page is INDIANAPOLIS SE SIDE, IN US (USC00124272), 5.9 miles from the city point. Population in the Census 2024 estimate is 891,484.
Zone 6bUSDA average annual extreme minimum -5°F to 0°F, from ZIP 46204 (0.7 miles from the city point used on this page).
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Last 32°F in spring
NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.
| Probability | Date | How to read it |
|---|---|---|
| 90% | April 6 | Earlier date. A last 32°F on or after this day is common. |
| 50% | April 20 | Median. |
| 10% | May 5 | Later date. A last 32°F on or after this day is uncommon. |
First 32°F in fall
NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.
| Probability | Date | How to read it |
|---|---|---|
| 10% | October 7 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | October 21 | Median. |
| 90% | November 3 | Later date. A first 32°F on or before this day is common. |
32°F growing-season length
Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.
| Probability the season is at least this long | Days |
|---|---|
| 10% | 203 |
| 50% | 183 |
| 90% | 163 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 23 | April 7 | March 25 |
| First, on or before | October 20 | November 1 | November 15 |
| Season at least | 225 days | 205 days | 185 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 17 | April 30 | April 16 |
| First, on or before | September 27 | October 11 | October 24 |
| Season at least | 182 days | 161 days | 142 days |
Station INDIANAPOLIS SE SIDE, IN US (USC00124272). Completeness flag R, 23 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 257.6 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.
Check a crop against this station
Indianapolis city (balance), IN
Zone 6bAverage annual extreme minimum -5°F to 0°F
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Indiana. Nearest qualified station: INDIANAPOLIS SE SIDE, IN US (USC00124272), 5.9 miles. Median last 32°F April 20. Median first 32°F October 21. The 50% growing-season length is 183 days.
32°F probabilities at this station
| 10% | 50% | 90% | |
|---|---|---|---|
| Last 32°F on or after | May 5 | April 20 | April 6 |
| First 32°F on or before | October 7 | October 21 | November 3 |
Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.
Planting calendar
Frost dates for Indiana are above. Planting windows appear for states with a cited extension guide. The fall and seed tools use the numbers you enter and the station dates.
Date checks use your device’s calendar and appear after the page loads.