diff --git a/R/geographic-spread.R b/R/geographic-spread.R
index a673ad1..88afd72 100644
--- a/R/geographic-spread.R
+++ b/R/geographic-spread.R
@@ -1,13 +1,41 @@
 #' State and Territorial Epidemiologists Reports of Geographic Spread of Influenza
 #'
+#' @md
+#' @param years a vector of years to retrieve data for (i.e. `2014` for CDC
+#'        flu season 2014-2015). CDC has data for this API going back to 2003
+#'        and up until the current, active flu season.
+#'        Default value (`NULL`) means retrieve **all** years. NOTE: if you
+#'        happen to specify a 2-digit season value (i.e. `57` == 2017-2018)
+#'        the function is smart enough to retrieve by season ID vs convert that
+#'        to a year.
 #' @export
 #' @examples \dontrun{
 #' geographic_spread()
 #' }
-geographic_spread <- function() {
+geographic_spread <- function(years=NULL) {
 
   meta <- jsonlite::fromJSON("https://gis.cdc.gov/grasp/Flu8/GetPhase08InitApp?appVersion=Public")
 
+  available_seasons <- sort(meta$seasons$seasonid)
+
+  if (is.null(years)) { # ALL YEARS
+    years <- available_seasons
+  } else { # specified years or seasons or a mix
+
+    years <- as.numeric(years)
+    years <- ifelse(years > 1996, years - 1960, years)
+    years <- sort(unique(years))
+    years <- years[years %in% available_seasons]
+
+    if (length(years) == 0) {
+      years <- rev(sort(meta$seasons$seasonid))[1]
+      curr_season_descr <- meta$seasons[meta$seasons$seasonid == years, "description"]
+      message(sprintf("No valid years specified, defaulting to this flu season => ID: %s [%s]",
+                      years, curr_season_descr))
+    }
+
+  }
+
   httr::POST(
     url = "https://gis.cdc.gov/grasp/Flu8/PostPhase08DownloadData",
     httr::user_agent(.cdcfluview_ua),
@@ -19,7 +47,7 @@ geographic_spread <- function() {
     encode = "json",
     body = list(
       AppVersion = "Public",
-      SeasonIDs = paste0(meta$seasons$seasonid, collapse=",")
+      SeasonIDs = paste0(years, collapse=",")
     ),
     # httr::verbose(),
     httr::timeout(.httr_timeout)
diff --git a/man/geographic_spread.Rd b/man/geographic_spread.Rd
index 425b1f1..e83907f 100644
--- a/man/geographic_spread.Rd
+++ b/man/geographic_spread.Rd
@@ -4,7 +4,16 @@
 \alias{geographic_spread}
 \title{State and Territorial Epidemiologists Reports of Geographic Spread of Influenza}
 \usage{
-geographic_spread()
+geographic_spread(years = NULL)
+}
+\arguments{
+\item{years}{a vector of years to retrieve data for (i.e. \code{2014} for CDC
+flu season 2014-2015). CDC has data for this API going back to 2003
+and up until the current, active flu season.
+Default value (\code{NULL}) means retrieve \strong{all} years. NOTE: if you
+happen to specify a 2-digit season value (i.e. \code{57} == 2017-2018)
+the function is smart enough to retrieve by season ID vs convert that
+to a year.}
 }
 \description{
 State and Territorial Epidemiologists Reports of Geographic Spread of Influenza