Indiana weather and outdoor projects
Indiana has cold winters, warm and humid summers and frequent spring rain. Northern Indiana, including the Fort Wayne area, is cooler and gets lake-effect snow near Lake Michigan, while the south warms up earlier and stays humid in summer.
Spring often brings long wet spells, so the most dependable dry stretches for deck staining and painting usually come in late summer and September. Freezing nights are common from November to March. Fall is a busy time for driveway sealing, which needs days and nights that stay warm enough, so it is best done before mid-October in most years.
Frost dates in Indiana
In Indianapolis, the median last spring freeze (32°F) is around April 15 and the median first fall freeze is around October 26, a frost-free season of about 193 days.
In Fort Wayne, the median last spring freeze (32°F) is around April 24 and the median first fall freeze is around October 21, a frost-free season of about 178 days.
Frost dates matter for concrete, which must not freeze in its first 48 hours, for paint and caulk that need nights above their minimum, and for lawn care, since crabgrass preventer goes down as the soil warms in spring. See how late in fall you can stain, paint or seal.
Best time to stain a deck in Indiana
In Indianapolis, the most reliable months are June–September. April–May and October can also work on the right days. November–March is too cold, with average highs around 44°F. In April and October, nights average about 44°F, so finish early on mild days and check the overnight low. May averages about 9 wet days a month, so wait for a clear stretch.
In Fort Wayne, the most reliable months are May–September. April and October can also work on the right days. November–March is too cold, with average highs around 41°F. April is cool, with highs around 61°F, so choose the warmest afternoons. In October, nights average about 43°F, so finish early on mild days and check the overnight low.
Check this week’s hour-by-hour verdict with the deck staining forecast.
Best time to paint outside in Indiana
In Indianapolis, the most reliable months are June–October. March–May and November can also work on the right days. December–February is too cold, with average highs around 39°F. March and November are cool, with highs around 52°F, so choose the warmest afternoons. In April, nights average about 43°F, so finish early on mild days and check the overnight low. May averages about 9 wet days a month, so wait for a clear stretch.
In Fort Wayne, the most reliable months are May–September. April and October can also work on the right days. November–March is too cold, with average highs around 41°F. In April and October, nights average about 41°F, so finish early on mild days and check the overnight low.
Check this week’s hour-by-hour verdict with the exterior painting forecast.
Best time to pour concrete in Indiana
In Indianapolis, the most reliable months are May–September. April and October can also work on the right days. November–March averages about 20 nights a month at or below 32°F, so fresh concrete needs blankets or heated enclosures. April and October bring about 3 freezing nights a month, so pick a mild spell and keep curing blankets on hand.
In Fort Wayne, the most reliable months are May–September. April and October can also work on the right days. November–March averages about 22 nights a month at or below 32°F, so fresh concrete needs blankets or heated enclosures. April and October bring about 5 freezing nights a month, so pick a mild spell and keep curing blankets on hand.
Check this week’s hour-by-hour verdict with the concrete pouring forecast.
Best time to seal a driveway in Indiana
In Indianapolis, the most reliable months are June–September. April–May and October can also work on the right days. November–March is too cold, with average highs around 44°F. April and October are cool, with highs around 65°F, so choose the warmest afternoons. May averages about 9 wet days a month, so wait for a clear stretch.
In Fort Wayne, the most reliable months are June–September. May and October can also work on the right days. November–March is too cold, with average highs around 41°F. In April, nights average about 39°F, too cold for the coating to dry and cure overnight. In May, nights average about 50°F, so finish early on mild days and check the overnight low. October is cool, with highs around 64°F, so choose the warmest afternoons.
Check this week’s hour-by-hour verdict with the driveway sealing forecast.
Best time to fertilize or treat a lawn in Indiana
In Indianapolis, the most reliable months are April–October. March and November can also work on the right days. December–February is too cold, with average highs around 39°F. March and November are cool, with highs around 52°F, so choose the warmest afternoons.
In Fort Wayne, the most reliable months are April–October. November–March is too cold, with average highs around 41°F.
Check this week’s hour-by-hour verdict with the lawn fertilizer forecast.
How the weather differs across Indiana
| Place | Hottest month avg high | Coldest month avg low | Rain per year | Last spring freeze | First fall freeze |
|---|---|---|---|---|---|
| Indianapolis | 85°F | 21°F | 44 in | April 15 | October 26 |
| Fort Wayne | 84°F | 18°F | 39 in | April 24 | October 21 |
Of the places above, Fort Wayne has the most good months for staining, painting and concrete combined (15 job-months), and Indianapolis has the fewest (14). If you live between them, expect something in between, and higher ground to be cooler with a shorter season.
Monthly weather in Indianapolis
| Month | Avg high | Avg low | Wet days* | Rain | 3 PM humidity | Freezing nights |
|---|---|---|---|---|---|---|
| January | 36°F | 21°F | 6 | 3.1 in | 67% | 26 |
| February | 41°F | 24°F | 5 | 2.4 in | 60% | 22 |
| March | 52°F | 33°F | 7 | 3.7 in | 51% | 16 |
| April | 64°F | 43°F | 8 | 4.3 in | 49% | 4 |
| May | 73°F | 54°F | 9 | 4.8 in | 53% | 0 |
| June | 82°F | 63°F | 8 | 5.0 in | 53% | 0 |
| July | 85°F | 66°F | 7 | 4.4 in | 53% | 0 |
| August | 84°F | 65°F | 6 | 3.2 in | 52% | 0 |
| September | 78°F | 57°F | 5 | 3.1 in | 49% | 0 |
| October | 66°F | 46°F | 6 | 3.2 in | 50% | 2 |
| November | 52°F | 35°F | 6 | 3.5 in | 57% | 13 |
| December | 40°F | 26°F | 6 | 2.9 in | 66% | 23 |
*Days with at least 0.1 inch of rain or melted snow. Freezing nights: average nights a month at or below 32°F. Humidity is calculated from NOAA hourly normal temperature and dew point at 3 PM.
Monthly weather in Fort Wayne
| Month | Avg high | Avg low | Wet days* | Rain | 3 PM humidity | Freezing nights |
|---|---|---|---|---|---|---|
| January | 33°F | 18°F | 6 | 2.5 in | 71% | 28 |
| February | 37°F | 21°F | 5 | 2.1 in | 66% | 24 |
| March | 48°F | 29°F | 6 | 2.8 in | 56% | 21 |
| April | 61°F | 39°F | 8 | 3.7 in | 49% | 7 |
| May | 72°F | 50°F | 8 | 4.6 in | 50% | 0 |
| June | 81°F | 60°F | 8 | 4.5 in | 51% | 0 |
| July | 84°F | 64°F | 7 | 4.0 in | 53% | 0 |
| August | 82°F | 61°F | 6 | 3.8 in | 55% | 0 |
| September | 76°F | 53°F | 6 | 3.0 in | 50% | 0 |
| October | 64°F | 43°F | 6 | 3.0 in | 51% | 4 |
| November | 49°F | 33°F | 6 | 3.0 in | 61% | 15 |
| December | 38°F | 24°F | 6 | 2.5 in | 71% | 25 |
Use the averages, then check the forecast
These ratings describe a typical month, not a particular week. A warm spell in a “poor” month can give you a good day, and a wet week can spoil a “good” one. Use this page to plan the season, then check the 7-day forecast for your ZIP code before you buy materials or book help. Each project forecast checks the hours after you finish too: overnight lows, dew and rain that would ruin fresh stain, paint, sealer or concrete.
About this data
Monthly temperatures, rain days, snowfall and freeze dates are NOAA National Centers for Environmental Information (NCEI) U.S. Climate Normals for 1991–2020 at INDIANAPOLIS, FT WAYNE INTL AP. Ratings apply the same temperature limits as our forecasts (for example, 50°F or warmer for deck stain and driveway sealer, and no freezing nights for new concrete) to the average month. Your product label always takes priority.
Frequently asked questions
When is the best time to stain a deck in Indiana?
In Indianapolis, June–September. In Fort Wayne, May–September. Look for at least 24 dry hours before and after, and nights above about 40°F. The deck staining forecast checks your exact week.
When is the last frost in Indiana?
Indianapolis: around April 15; Fort Wayne: around April 24. These are median dates from NOAA 1991–2020 normals, so a freeze after them happens in about half of years. Low spots and valleys freeze later in spring.
Can you pour concrete in winter in Indiana?
Yes, but it needs cold-weather practices. Indianapolis averages about 71 freezing nights from December to February, so fresh concrete needs insulated blankets, a heated enclosure or an accelerated mix, and must not freeze in the first 48 hours. Many homeowners wait for spring.
What months are best for sealing a driveway in Indiana?
In Indianapolis, June–September. In Fort Wayne, June–September. Most sealers need 50°F or warmer for 24 hours and a dry day after. See the driveway sealing forecast.