When to plant chives in Philadelphia, Pennsylvania
March 30 – April 13
Transplant outdoors · typical Philadelphia yearClimate basis: NOAA station Phila Franklin Inst, PA (USC00366886), 1 mi (1 km) from downtown Philadelphia (ZCTA 19107 centroid), elevation 60 ft, on the 1991–2020 climate normals. Transplant chives outdoors from approximately the dates above, anchored to the median last spring 32°F freeze (March 30). One year in ten still freezes after April 12.
The Philadelphia year
- indoors under lights
- in the garden
- frost-free season
- 1-in-10 years still freeze to Apr 12
Every method, with its sources
Start seeds indoors
Feb 2 – Feb 16Wisconsin Horticulture starts chive seed indoors before the last frost date for planting out after frost danger, but says only 'a few weeks'; USU Extension fixes the lead time at 6 to 8 weeks of growth before garden planting, so sowing runs 8 to 6 weeks before the last spring freeze. Anchored to the median last spring freeze (Mar 30). University of Minnesota Extension · University of Wisconsin-Madison Division of Extension, Wisconsin Horticulture · Utah State University Extension
Transplant outdoors
Mar 30 – Apr 13UMN Extension says the easiest and most successful way to grow chives is planting rooted clumps in spring after frost danger has passed, and Wisconsin Horticulture likewise puts indoor-started plants out after the danger of frost is past; both agree, so the window opens at the last spring freeze. Anchored to the median last spring freeze (Mar 30). University of Minnesota Extension · University of Wisconsin-Madison Division of Extension, Wisconsin Horticulture · Utah State University Extension
Variety assumption: Wisconsin Horticulture warns that direct-seeded chives give little or no harvest the first year, so rooted clumps or indoor-started transplants are the practical route.
These windows describe typical years (1991–2020 climate normals), not this year's forecast. Freezes happen outside them — especially in frost pockets, valleys, and urban edges. Watch the forecast before committing tender plants.
Crop rule sources (3)
- University of Minnesota Extension: Growing chives in home gardens (accessed 2026-07-25)"The easiest and most successful way of growing chives is planting rooted clumps in spring after frost danger has passed."
- University of Wisconsin-Madison Division of Extension, Wisconsin Horticulture: Chives, Allium schoenoprasum (accessed 2026-07-25)"Seeds can be started indoors a few weeks before the average date of last frost to be planted outside after the danger of frost is past, or can be direct seeded once the soil is warm."
- Utah State University Extension: How to Grow Chives in Your Garden (accessed 2026-07-25)"Transplants need 6-8 weeks of growth before planting in the garden."