Last spring frost
Apr 10
Frost Dates for Williams, IN
First fall frost
Oct 30
Growing season
201 days
Hardiness zone
6b
In an average year around Williams, IN, the last spring frost (32°F) is about Apr 10 and the first fall frost is about Oct 30, giving roughly a 201-day growing season. To be safe most years, wait until Mar 25 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | May 12 | Apr 23 | Apr 6 |
| Freeze (32°F) | Apr 30 | Apr 10 | Mar 25 |
| Hard (28°F) | Apr 15 | Mar 28 | Mar 11 |
| Severe (24°F) | Apr 1 | Mar 16 | Feb 28 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 12 | May 5 | May 1 | Apr 26 | Apr 23 | Apr 19 | Apr 15 | Apr 11 | Apr 6 |
| 32°F | Apr 30 | Apr 22 | Apr 18 | Apr 14 | Apr 10 | Apr 6 | Apr 3 | Mar 31 | Mar 25 |
| 28°F | Apr 15 | Apr 7 | Apr 3 | Mar 31 | Mar 28 | Mar 25 | Mar 20 | Mar 17 | Mar 11 |
| 24°F | Apr 1 | Mar 28 | Mar 23 | Mar 19 | Mar 16 | Mar 13 | Mar 9 | Mar 5 | Feb 28 |
| 20°F | Mar 23 | Mar 17 | Mar 13 | Mar 9 | Mar 6 | Mar 3 | Feb 28 | Feb 23 | Feb 13 |
| 16°F | Mar 13 | Mar 8 | Mar 4 | Mar 1 | Feb 25 | Feb 20 | Feb 15 | Feb 10 | Feb 3 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Oct 6 | Oct 19 | Oct 31 |
| Freeze (32°F) | Oct 16 | Oct 30 | Nov 11 |
| Hard (28°F) | Oct 29 | Nov 9 | Nov 26 |
| Severe (24°F) | Nov 6 | Nov 20 | Dec 7 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 6 | Oct 11 | Oct 14 | Oct 17 | Oct 19 | Oct 21 | Oct 23 | Oct 26 | Oct 31 |
| 32°F | Oct 16 | Oct 21 | Oct 24 | Oct 27 | Oct 30 | Nov 1 | Nov 2 | Nov 5 | Nov 11 |
| 28°F | Oct 29 | Nov 1 | Nov 4 | Nov 6 | Nov 9 | Nov 12 | Nov 15 | Nov 20 | Nov 26 |
| 24°F | Nov 6 | Nov 10 | Nov 14 | Nov 16 | Nov 20 | Nov 24 | Nov 28 | Dec 1 | Dec 7 |
| 20°F | Nov 13 | Nov 19 | Nov 24 | Nov 28 | Dec 1 | Dec 4 | Dec 8 | Dec 13 | Dec 21 |
| 16°F | Nov 23 | Nov 29 | Dec 2 | Dec 6 | Dec 10 | Dec 16 | Dec 20 | Dec 26 | Jan 1 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Bedford 5 Wnw, In, about 6.4 miles away@if(!empty($station['elevation_ft'])), at 760 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Williams, IN?
On average, the last spring frost (32°F) around Williams, IN is about Apr 10. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 25.
When is the first frost in the fall?
The first fall frost around Williams, IN typically arrives about Oct 30. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Apr 10 on average, or Mar 25 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 201 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 47470 Planting calendar → Indiana frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026