4725 - Halloween Pumpkin. 100 days. Fruits are medium orange with shallow ribs and can keep for a few months. Sow 2-3 seeds, 2-3 cm deep, 45-60 cm apart. Seeds can also be started indoors 3-4 weeks before frost date for earlier harvests. Optimal soil temperature for germination is 29-35ºC. Harden plants off by reducing temperature, water, and fertilizer. Plant outdoors after danger of all frost has passed.