Freeze Warnings are in effect for 38 counties in Indiana from early Sunday morning, with lows as cold as 30 degrees expected.
The warnings cover central, northern, east central and southeast Indiana.
Three National Weather Service offices issued them.
Frost and freeze conditions could kill crops and other sensitive vegetation.
Unprotected outdoor plumbing could also be damaged.
Central Indiana: 15 Counties
NWS Indianapolis expects lows as low as 30 degrees.
The warning runs 2 a.m. to 9 a.m. EDT Sunday.
Counties: Clinton, Howard, Montgomery, Boone, Tipton, Hamilton, Madison, Delaware, Randolph, Hendricks, Hancock, Henry, Shelby, Rush and Decatur.
Cities include Carmel, Fishers, Noblesville, Zionsville, Plainfield, Brownsburg, Anderson, Muncie, Kokomo, Greenfield, Crawfordsville, Frankfort, Lebanon, Shelbyville and Greensburg.
Below-freezing temperatures are expected over northern and eastern central Indiana for the first time this fall.
Indianapolis itself is not in the warning list.
NWS Indianapolis says all of central Indiana is under either a Frost Advisory or a Freeze Warning.
Northern Indiana: 15 Counties
NWS Northern Indiana expects lows as low as 31 degrees.
The warning runs 3 a.m. to 9 a.m. EDT Sunday.
Counties: Lagrange, Steuben, Noble, De Kalb, Whitley, Kosciusko, Allen, Miami, Wabash, Huntington, Wells, Adams, Grant, Blackford and Jay.
Cities include Fort Wayne, Huntington, Wabash, Marion, Peru, Warsaw, Angola, Auburn, Columbia City, Bluffton and Decatur.
Lows will be well into the 30s again, and the office has a mix of frost and freeze alerts in effect.
Sunday afternoon is warmer, with highs in the low 60s.
Source: NWS Northern Indiana on X
East Central and Southeast Indiana: 8 Counties
NWS Wilmington expects lows in the upper 20s to lower 30s.
The warning runs 1 a.m. to 9 a.m. EDT Sunday.
Counties: Wayne, Fayette, Union, Franklin, Ripley, Dearborn, Ohio and Switzerland.
Cities include Richmond, Connersville, Liberty, Brookville, Batesville, Versailles, Milan, Lawrenceburg, Aurora, Rising Sun and Vevay.
NWS Wilmington says freezing conditions will be damaging to outdoor vegetation.
Source: NWS Wilmington OH on X
How to Prepare
A Freeze Warning means sub-freezing temperatures are expected.
Take steps now to protect tender plants from the cold.
Cover or bring in sensitive plants before nightfall.
Protect exposed outdoor plumbing, such as hose bibs and irrigation lines.
Local forecasts and alerts: NWS Indianapolis and NWS Northern Indiana.
NWS Northern Indiana also has a fall frost climatology page.
For more on freezes and plant damage, see the NWS Cold Weather Safety guide.
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