City	Sow outdoors	Last frost
Indianapolis	Apr 6 to May 4	Apr 20
Fort Wayne	Apr 10 to May 8	Apr 24
Evansville	Mar 15 to Apr 12	Mar 29
Carmel	Apr 7 to May 5	Apr 21
Fishers	Apr 7 to May 5	Apr 21
South Bend	Apr 9 to May 7	Apr 23
Bloomington	Apr 1 to Apr 29	Apr 15
Noblesville	Apr 7 to May 5	Apr 21
Hammond	Apr 9 to May 7	Apr 23
Lafayette	Apr 12 to May 10	Apr 26
Greenwood	Apr 6 to May 4	Apr 20
Gary	Apr 8 to May 6	Apr 22
Westfield	Apr 7 to May 5	Apr 21
Muncie	Apr 2 to Apr 30	Apr 16
Kokomo	Apr 13 to May 11	Apr 27
Terre Haute	Apr 1 to Apr 29	Apr 15
Anderson	Apr 5 to May 3	Apr 19
Jeffersonville	Mar 17 to Apr 14	Mar 31
Elkhart	Apr 12 to May 10	Apr 26
Columbus	Mar 28 to Apr 25	Apr 11
Mishawaka	Apr 9 to May 7	Apr 23
Lawrence	Apr 4 to May 2	Apr 18
West Lafayette	Apr 12 to May 10	Apr 26
Portage	Apr 8 to May 6	Apr 22
Plainfield	Mar 29 to Apr 26	Apr 12
New Albany	Mar 17 to Apr 14	Mar 31
Merrillville	Apr 8 to May 6	Apr 22
Crown Point	Apr 15 to May 13	Apr 29
Richmond	Apr 10 to May 8	Apr 24
Valparaiso	Apr 8 to May 6	Apr 22
Goshen	Apr 12 to May 10	Apr 26
Brownsburg	Mar 29 to Apr 26	Apr 12
Zionsville	Apr 7 to May 5	Apr 21
Michigan City	Apr 5 to May 3	Apr 19
Granger	Apr 9 to May 7	Apr 23
Schererville	Apr 9 to May 7	Apr 23
Hobart	Apr 8 to May 6	Apr 22
Marion	Apr 12 to May 10	Apr 26
Franklin	Apr 6 to May 4	Apr 20
Greenfield	Apr 5 to May 3	Apr 19
East Chicago	Apr 9 to May 7	Apr 23
Avon	Mar 29 to Apr 26	Apr 12
St. John	Apr 9 to May 7	Apr 23
Munster	Apr 9 to May 7	Apr 23
Highland	Apr 9 to May 7	Apr 23
La Porte	Apr 5 to May 3	Apr 19
Seymour	Apr 2 to Apr 30	Apr 16
Clarksville	Mar 17 to Apr 14	Mar 31
Shelbyville	Apr 3 to May 1	Apr 17

Questions

When should I plant swiss chard in Indiana?

In Indianapolis, sow outdoors from April 6 to May 4. Across Indiana the window opens between March 15 and April 15, depending on the local last frost.

How is this date worked out?

Sow outdoors from 2 weeks before to 2 weeks after the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.