Zonal Statistics Freezing QGIS 2.2

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Running on Windows; 8gb memory, 500gb HD, i5 cpu; Raster file: 250mb

I am having a problem with zonal statistics advancing past 17%. I am trying to run statistics on a crop grown in certain counties. In the image below, you can see the counties of Washington state in the vector buffer. The raster data is dispersed throughout the state.

I have run zonal statistics on much larger raster files. The raster image comes from CDL NASS portal, which contains many more pixel values other than the one I have isolated. But it allows for a researcher to isolate the variable (crop) they are interested in and download that image without the rest of the data.

Any ideas?





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