Your sign in doesn't indicate your climate zone, but some facts about this pine -
prefers hot, dry summers; absence of summer fog, requires generally mild winters

Specific stands may adapt their own germination requirements according to conditions there - i.e. Digger pine growing on sites where winter temperatures fluctuate greatly, such as the Modoc Plateau, may have adapted a longer requirement for chilling to prevent germination until spring. Seeds from populations growing on low-elevation sites with milder winters tend to require less chilling, thereby favoring early establishment before soil moisture becomes limiting
And, It is classed as very intolerant of shade

Soak seed 48 hours, provide a moist chill of approximately 4 months, move to 70 for germination. Detailed suggestions here -