| September 3 |
Exercised the 2020 options on the following players: RHP Juan Aguilera, INF Joel Davis, RHP Tyler Fallwell, C Justin Felix (Rookie), RHP Ryan Flores, RHP Nate Gercken, OF Jeremy Hazelbaker, RHP Sam Held, RHP Taylor Jordan, RHP Eric Karch, C Dylan Kelly, RHP Matt Pobereyko, RHP Joe Riley, INF Adam Sasser, INF Jose Sermo, RHP Carlos Sierra, INF Drew Stankiewicz, RHP Pete Tago, LHP Jose Velez, OF Kyle Wren and OF Sebastian Zawada |
| August 25 |
Released RHP Alex House |
| August 24 |
Signed RHP Joe Riley |
| August 13 |
Signed INF Joel Davis |
| July 29 |
Signed OF Jeremy Hazelbaker |
| July 28 |
Traded OF Michael Lang to St. Paul for two (2) players to be named later |
| July 25 |
Activated LHP Jose Velez from the Disabled List. |
| July 21 |
Signed LHP Andrew Chin |
| July 10 |
Placed LHP Jose Velez on the Disabled List retroactive to June 30 and acquired RHP Pete Tago from York (Atlantic League) for a player to be named later; signed RHP Pete Tago |
| July 7 |
Placed RHP Max Duval on the Inactive List retroactive to July 6 |
| July 3 |
Signed RHP Nile Ball |
| July 2 |
Sold the contract of RHP Jason Garcia to the Tampa Bay Rays. |
| June 19 |
Acquired RHP Ryan Flores from Trois-Rivieres (Can-Am League) to complete an earlier trade and signed RHP Ryan Flores |
| June 15 |
Released OF Lucas Bonfield and C Hunter Wood |
| June 14 |
Signed RHP John McKinney and INF Adam Sasser |
| June 13 |
Released RHP Zach Jemiola |
| June 12 |
Released LHP Max Schuh |
| June 7 |
Activated OF Sebastian Zawada from the Inactive List; released OF Daytona Bryden and INF Nelson Ward |
| June 2 |
laced INF Dean Green on the Disabled List retroactive to May 31; signed LHP Max Schuh and INF Drew Stankiewicz |
| May 27 |
Signed OF Kyle Wren |
| May 24 |
Sold the contract of RHP Anthony Bender to the Milwaukee Brewers |
| May 14 |
Released LHP Evan DeLuca, OF Tillman Pugh and RHP Ivan Vieitez; signed OF Lucas Bonfield and placed OF Sebastian Zawada on the Inactive List retroactive to May 4 |
| May 13 |
Released RHP Ryan Caporice and traded LHP Patrick Schuster to Fargo-Moorhead for a player to be named later. |
| May 11 |
Released LHP Brandon Presley |
| May 8 |
Traded RHP J.D. Busfield to Rockland (Can-Am League) for a player to be named later |
| May 6 |
Signed RHP Zach Jemiola |
| May 5 |
Signed C Hunter Wood |
| April 23 |
Released LHP Ryan Horstman |
| April 12 |
Acquired RHP Zach Jemiola from Sugar Land (Atlantic League) for future considerations
Signed LHP Jose Velez |
| April 11 |
Signed RHP Anthony Bender and RHP Matt Pobereyko
RHP Luis Gamez signed with Quintana Roo (Mexican League) |
| April 10 |
Signed RHP Tyler Fallwell and RHP Eric Karch |
| April 5 |
Signed RHP Carlos Sierra |
| April 4 |
Signed INF Nelson Ward |
| April 3 |
Signed RHP Taylor Jordan |
| March 28 |
Released LHP Jay Johnson, RHP Luis Mateo and INF David Kerian
Traded INF Blake Schmit to St. Paul for a player to be named later |
| March 22 |
Released INF Jay Baum |
| March 19 |
Signed INF Dean Green |
| March 7 |
Signed INF Jose Sermo |
| February 28 |
Sold the contract of RHP Justin Vernia to the Arizona Diamondbacks.
Signed RHP J.D. Busfield, OF Tillman Pugh and OF Sebastian Zawada |
| February 20 |
Released C Daniel Jackson |
| February 13 |
Signed RHP Max Duval and RHP Nate Gercken |
| February 8 |
Signed RHP Ryan Caporice, LHP Ryan Horstman and RHP Ivan Vieitez |
| February 7 |
Sold the contract of RHP James Dykstra to the Cincinnati Reds. |
| January 29 |
Acquired RHP Ivan Vieitez from Schaumburg (Frontier League) for a player to be named later. |
| January 18 |
Signed LHP Evan DeLuca |
| January 17 |
Traded OF Luis Durango to Quebec (Can-Am League) for INF Jay Baum |
| January 16 |
Traded INF Jay Baum to Quebec (Can-Am League) for LHP Jay Johnson |
| January 11 |
Sold the contract of RHP Eric Karch to the Minnesota Twins
Signed OF Daytona Bryden, RHP Luis Gamez and LHP Brandon Presley |
| January 4 |
Signed C Dylan Kelly |
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Saltdogs Sweep Double-Header, Gotta Drives in Six, McCanna Tames Dogs 
McCanna, Kuhns Tame Dogs 
Evaluating Nick Franklin to Kane County Cougars from Sioux City Explorers Trade 
Railroaders Edge DockHounds, Ledet, Pimentel, Jones Toss Gems, Mangieri Homers Twice 
Early Runs Back Ledet in Explorers Victory 
De La Trinidad Leads Cougars, Maris Drives in Six, Bockelie Gets Railroaders Rolling 
Lidge Drives in Six, Marriaga Plates Five, Thorpe Sharp for Monarchs 
Wigginton Too Much for Explorers 
Barnum Homers Twice, Maris Delivers Game-Winner, Barringer Shines for Dogs 
Seven-Run Fifth Not Enough for Sioux City 
RailCats Down Saltdogs in Slugfest, Minier, Murphy Receive Monthly Honors, Navarro Honored 
Explorers Sweep Dogs, Railroaders, Canaries Rally, McGovern Dominates for RedHawks 
Tiberi, Six-Run Frame Help Explorers Complete Sweep 
Ledet Tosses Gem, RedHawks Win in Extra-Innings, Kerrigan Goes Deep 
Ledet, Explorers Bullpen Tames Dogs 
Minier Tosses Gem, Martin Delivers Walk-Off Win, Gomez, Abreu Drive in Five 
Martin Walk-Off Single Completes Explorers Comeback Win 
Prime Homers Twice, Ramirez Wins His Eighth, RedHawks Hold Off Explorers 
Explorers Comeback Falls Short in Fargo 
Sagdal Delivers Walk-Off Hit, Railroaders Blank RailCats, Explorers Shock RedHawks 
Explorers Mount Late Rally to Shock RedHawks 
Hall, Delano Toss Gems, Explorers Rally in Fargo, Walraven, Maris Homer Twice 
Explorers Rally in Ninth to Down RedHawks 
TWITA: Sioux City Explorers Manager Steve Montgomery 