When to Plant Peonies: Fall Planting by Zone, Depth & Care
Paeonia lactiflora and hybrids · zones 3–8
Fall is the best time to plant and divide peonies. Bare-root divisions set out in late summer or fall have time to grow new roots before the soil freezes. Get two details right — timing and planting depth — and a peony can live for decades.
When to plant peonies by USDA zone
| USDA zone | Typical first frost (32°F) | Bare-root planting window | Top eye below soil |
|---|---|---|---|
| Zone 3 | Sep 23 | Aug 12 – Sep 23 | 1.5–2 in. |
| Zone 4 | Sep 30 | Aug 19 – Sep 30 | 1.5–2 in. |
| Zone 5 | Oct 7 | Aug 26 – Oct 7 | 1.5–2 in. |
| Zone 6 | Oct 19 | Sep 7 – Oct 19 | 1.5–2 in. |
| Zone 7 | Oct 28 | Sep 16 – Oct 28 | 1–2 in. (about 1 in. in the warmest spots) |
| Zone 8 | Nov 10 | Sep 29 – Nov 10 | No deeper than 1 in.; pick low-chill, early cultivars |
| Zones 9–11 | Frost late or rare | Not recommended: winters usually give too little cold for herbaceous peonies to bloom reliably (NC State, Clemson). | |
How we calculated this table: the “typical first fall frost” is the median, across all ZIP codes in each zone, of the nearest NOAA NCEI 1991–2020 Climate Normals station’s 50%-probability 32°F date (the same data as our frost-date tables). The window runs from about 6 weeks before that date up to it, which matches extension timing of September in Iowa, late September–October in Kansas, and September–October in Wisconsin, and leaves the roots time to grow before the soil freezes (Iowa State advises at least 4–6 weeks). Your own dates can differ by weeks; use the ZIP planner for yours.
How to plant a bare-root peony
- Pick the spot: at least 6 hours of direct sun, well-drained soil, and good air movement. Keep peonies away from tree roots and walls, and allow 3–4 feet between plants.
- Check the soil: peonies prefer a pH of about 6.5–7.0. Loosen heavy clay with compost or finely ground pine bark.
- Dig: make a hole about 12–18 inches deep and 12 inches wide, then refill part of it to form a low cone.
- Set the depth: spread the roots over the cone so the pink buds (“eyes”) point up and sit 1–2 inches below the surface (about 1 inch in warm zones). Divisions with 3–5 eyes reach blooming size fastest.
- Backfill and water: firm the soil to remove air pockets, then water thoroughly. Check the depth again after the soil settles.
The #1 mistake: planting too deep. Iowa State and Wisconsin Extension report that peonies with buds set more than 2 inches deep often fail to bloom well, and Clemson Extension calls deep planting the most common cause of bloom failure.
Where you garden: regional notes
- North & Upper Midwest (zones 3–5) — Plant early, in late August or September, so roots establish before the ground freezes. Peonies are fully winter-hardy here.
- Mid-Atlantic, Midwest & Plains (zones 5–7) — September through October is ideal. NC State notes peonies do best in zones 5–7.
- Southeast, Texas & warm zone 8 — Choose early-blooming single, Japanese or low-chill types (for example ‘Coral Charm’, ‘Festiva Maxima’, ‘Felix Crousse’, ‘Monsieur Jules Elie’). Plant no deeper than 1 inch, skip winter mulch (it insulates the roots from needed cold), and give light afternoon shade.
- Gulf Coast, Florida, low desert & coastal California (zones 9–11) — Too little winter chill for reliable bloom; herbaceous peonies are not recommended.
- West — Two peonies are native to the western US (P. brownii and P. californica), though they are rarely sold for gardens.
Fall care for established peonies
- Cut back after frost: cut herbaceous peony stems to the ground after frost and throw them away rather than composting them. This removes spores of botrytis blight and leaf blotch.
- Divide or move in September–October: cut stems near the ground, dig the clump, wash off the soil, and cut it into sections with 3–5 eyes each. Moved plants may skip blooming for a year.
- Never cut back tree peonies: they are woody shrubs and won’t regrow from the ground. Itoh (intersectional) peonies die back like herbaceous types.
Year-round care
- Water: water new plants deeply every 10–14 days in dry weather. Established peonies tolerate drought well.
- Fertilizer: go light. Use a low-nitrogen fertilizer (such as 5-10-10) in spring when shoots are 2–3 inches tall; too much nitrogen means leaves instead of flowers.
- Support: set hoops or stakes in spring for heavy double flowers.
- Deadhead: remove spent flowers and seed heads after bloom.
- Ants are harmless: they feed on sugary sap on the buds. Peonies do not need ants to open.
- Deer: NC State notes deer usually leave peonies alone.
Herbaceous, tree or Itoh?
| Type | Growth | Fall care |
|---|---|---|
| Herbaceous (P. lactiflora and hybrids) | Bushy, dies to the ground each winter; the most common type | Cut to the ground after frost |
| Tree (P. suffruticosa and others) | Woody shrub, 4–5 ft; blooms a week or two earlier; likes afternoon shade | Do not cut back; plant the graft union about 1 in. below ground |
| Itoh / intersectional | Hybrid of the two; short woody stems die back in winter | Cut back like herbaceous types |
Frequently asked questions
When should I plant peonies in the fall?
Plant bare-root peonies from about mid-August in the coldest zones to October or early November in zone 8 — roughly the 6 weeks before your typical first fall frost. Extension guides give September in Iowa, late September–October in Kansas, and September–October in Wisconsin, and advise leaving at least 4–6 weeks before the ground freezes so roots can establish.
How deep do you plant peony roots?
Set the pink buds (eyes) 1–2 inches below the soil surface in most of the country, and no deeper than about 1 inch in warm areas such as zone 8. Planting too deeply is the most common reason peonies fail to bloom.
Can I plant peonies in spring?
Potted peonies can be planted any time during the growing season. Bare-root peonies, usually sold by mail-order nurseries, are planted in late summer to fall.
Why is my peony not blooming?
Common causes are planting too deep, plants that are still young (garden peonies usually begin blooming within about three years), too much shade or nitrogen, overcrowding, competition from tree roots, late freezes, and too little winter chill in zones 8–9.
Can peonies grow in Florida or zone 9?
Herbaceous peonies need winter cold to flower. Extension sources list zones 3–8 and note poor performance in the lower South, so they are generally not recommended in zones 9–11.
Sources & further reading
- Iowa State University Extension (Yard and Garden): When is the best time to plant peonies?
- Iowa State University Extension (Yard and Garden): How and where do I plant peonies?
- Iowa State University Extension (Yard and Garden): Transplanting and dividing peonies
- Iowa State University Extension (Yard and Garden): How to plant perennials (fall planting timing)
- University of Wisconsin–Madison Extension, Wisconsin Horticulture: Peony
- Kansas State University Research and Extension (Johnson County): Fall is the best time to add peonies to the garden
- Clemson Cooperative Extension, Home & Garden Information Center: How to grow peonies in South Carolina (HGIC 1170)
- NC State Extension Gardener Plant Toolbox: Paeonia – herbaceous types
- Frost dates: NOAA NCEI U.S. Climate Normals 1991–2020; zones: USDA 2023 Plant Hardiness Zone Map ZIP data (PRISM Climate Group, Oregon State University).
More planting guides
Zone 3 · Zone 4 · Zone 5 · Zone 6 · Zone 7 · Zone 8 · Frost dates · All planting calendars · Weed guide