Bulk foods such as seeds and beans are graded according to quality. The grading scale ranges from 1 to 5. Grade 1 pinto beans have been sorted prior to sale and have the lowest percentage of foreign material, damaged, split or otherwise defective beans. Grade 4 pinto beans are at the low end of the scale and therefore contain a higher amount of defects that should be removed before planting.
Sort through the Grade 4 pinto beans. Pick out any foreign material or any beans that are split, undersized, damaged or discolored.
Wait until the right time to plant. Pinto beans will not germinate when the soil temperature is below 60 degrees Fahrenheit. Beginning in spring, use a soil thermometer to take the temperature of the soil at a depth of 3 inches every morning. Record the temperatures. When your weekly average is above 60 degrees Fahrenheit, your pinto beans can be planted.
Prepare the planting site. Pinto beans need fertile soil to produce fertile beans. Use a hand cultivator or rototiller to till the soil to a depth of 1 foot. Spread 2 to 8 inches of aged compost (depending on soil fertility) over the tilled area. Till the soil again to a depth of 1 foot and smooth the area with a rake.
Plant your pinto beans 3 inches deep and 4 inches apart in rows that are 20 to 30 inches apart.
Water the planting area so that the top 18 inches of the soil are quite moist but not soaking.
Fill in the spaces left by any ungerminated pinto beans by transplanting the seedlings. Do this two weeks after the seedlings have germinated. Water the soil again to a depth of 18 inches.