Variation in soil properties can cause difference in plant growth and crop yield. Such these variations may follow random or spatial patterns. Spatial variations in soil properties and crop yield can be investigated using the geostatistics technique. There are a little information on this topic rainfed wheat fields in the semi-arid region. This study was conducted in eighty four rainfed lands with a slope range from 0-2 % in Zanjan province. Soil properties (particle size distribution, pH, salinity, cation exchange capacity, organic matter, and lime) were investigated along with wheat grain yield in rainfed lands. The geostatistics technique was used to determine spatial variation patterns of variables and the spatial interpolation was computed using the kriging method. The results indicated that wheat grain yield in the rainfed lands varies from 660 to 1520 kg per hectare. Salinity was the most important soil variable determining wheat grain yields in rainfed lands. Wheat grain yield followed from a strongly spatial variation pattern and was modeled as the spherical function. Gravel, cation exchange capacity and lime appeared spatial variation pattern among all soil variables. This study showed that despite soil salinity is a main factor determining wheat grain yield, it can’t be used to estimate spatial variation of wheat grain yield in the rainfed lands. Managing the use of chemical fertilizers is essential to prevent the negative effects of salinity in rainfed fields.