65-70 days. This determinate variety was developed at Oregon State University. Their research shows that Oregon Spring will produce incredibly early yields of tomatoes when planted outside a month before your last frost date, with no protection except on frosty nights.

Pack of 12 seeds

Days to maturity are calculated from date of transplant.
 
Determinate tomatoes
Grow compactly, sprawling laterally, usually do not require staking, and fruit ripens over a short period of time
 
Indeterminate tomatoes
Grow on long vines, generally require pruning to 1 or 2 leaders that need to be trellised
 
Direct Sowing
• Not recommended

Transplanting
• Sow seeds in trays 6-8 weeks before anticipated transplant date; up-pot into 3-4 inch pots when the first set of true leaves appears
• Strong light and cooler temperatures (60-70°F) prevent plants from getting leggy
• Fertilize every 10-14 days
• When transplanting work in compost, 1/2 cup of Complete Organic a Fertilizer, and handful of bone meal
• Determinates can be spaced 18-24 inches apart, indeterminates 24-36 inches apart
• Tomatoes can be buried up to the top 2 sets of leaves
• Use Kozy-Coats or Victorian Bell Cloches to protect young plants