CalCOFI conducts seasonal, quarterly cruises off southern & central California from nearshore to ~400nm offshore. The 70yr old program & time-series originally sailed monthly, surveying the entire California coastline with multiple ships. Since 1984, when the current 75 station pattern was established using a single ship. The quarterly cruises are scheduled within these desired start & end date windows. Winter & Spring cruises are typically longer & include stations north of Pt Conception.
| Target Dates for CalCOFI Time-series Cruises | |
| Desired Windows | Acceptable Start – End Dates |
| Winter: Jan 10 – 25 | Jan 2 – Feb 22 |
| Spring: April 10 – 25 | April 01 – May 22 |
| Summer: July 10 – 25 | July 01 – Aug 22 |
| Fall: Oct 10 – 25 | Oct 01 – Nov 22 |
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