Conditional — Some Areas
phacelia (zones 2-11) has limited zone overlap with Indiana (5b-6b). Only zones 5-6 in the state are suitable.
Your yard isn't the whole zone.
Phacelia is grown as an annual, so your winter zone isn't the deciding factor — your frost-free window is, and slope, trees, and low spots move the last-frost date across a single yard. Enter your address and we'll score phacelia against your parcel's actual frost dates, sun, and soil.
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Zone Comparison
Phacelia Needs
- USDA Zones: 2-11
- Soil pH: 6.4 - 8.6
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 100+
Indiana Has
- USDA Zones: 5b-6b
- Last Frost: Apr 10 - May 10
- First Frost: Oct 1 - Oct 25
- Annual Rainfall: 36-46 inches
- Common Soils: Silt loam, Clay loam, Glacial till
Plant Zone Range (zones 2-11)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Phacelia in Indiana
The frost window
Across Indiana, the last spring frost clears between Apr 10 and May 10, and the first fall frost lands between Oct 1 and Oct 25 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 144-day window you can count on — up to 198 days on a mild site in a kind year.
Frost tenderness
Phacelia is frost-tender — its listed minimum temperature is 52°F (USDA PLANTS Database) — so set plants out after the last frost has cleared your local site, not the state's earliest date.
Days to maturity vs. the window
At 45 days to maturity (USDA PLANTS Database), a planting right after last frost ripens with 99 days to spare even in Indiana's tightest frost scenario — room for a later start or a second sowing.
Timing tuned to sub-state frost dates — St. Joseph County, not the statewide average.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Phacelia wants 100+ frost-free days; a typical Indiana site sees ~190 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Phacelia needs ~1000 GDD (base 50°F) to ripen. The state median runs ~3500 GDD (USDA NRCS county aggregates), so Indiana's typical season clears that easily.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Phacelia likes near-neutral soil (pH 6.4-8.6). That's the common-ground band across Indiana's silt loam and clay loam — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Indiana site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Your land, not the state average
Whether phacelia thrives in Indiana comes down to drainage, and SSURGO drainage class flips from well-drained to poorly-drained parcel to parcel — your soil map unit, not the state average, is the real answer.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH and drainage requirements from USDA PLANTS Database. Indiana soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Phacelia in Indiana — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 2-11 (USDA PLANTS Database)
- State Zones: 5b-6b (USDA ARS PHZM 2023)
- Growing Season: Apr 10 - May 10 to Oct 1 - Oct 25 (NOAA Climate Normals)
- Days to Maturity: 45 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Indiana growers also need to think about:
Heavy clay soils limit drainage in many areas
Mounded rows and compost open clay up — and where water still stands, a raised bed ends the argument.
Late spring frosts through early May
Hold tender transplants until your local last-frost normal clears — hardy greens will happily take the early slot.
Hot humid summers promote blight and mildew
Mulch to stop soil splash, water at the base, and rotate crop families — the blight playbook your extension teaches.
Growing phacelia here specifically
Phacelia rates to USDA zones 2–11 and is hardy to about 52°F, but cold isn't the risk in Indiana — wet is: with roughly 37.8% of its soils poorly-drained (SSURGO), soggy ground rots the roots.
Give phacelia a raised bed or mounded row with coarse amendment so its roots never sit wet. How to handle it →
Timing shifts within Indiana
Indiana isn't one climate. In St. Joseph County, the last hard freeze (28°F) holds until about Apr 2 — roughly 14 days later than the recorded state median — so plant phacelia to your county's window, not the statewide date.
County last-freeze dates: NOAA/PRISM Climate Normals 1991-2020, 28°F threshold (earlier than the folk 32°F "last frost"). A parcel report resolves your address's own frost dates.
Pollinator + Wildlife Value
Phacelia draws pollinators (high value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops.
Indiana Cooperative Extension
For Indiana-specific cultivar recommendations, planting calendars, and pest pressure for phacelia, the canonical source is Purdue Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Phacelia native to Indiana?
Phacelia is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in Indiana. It can still earn a place in a Indiana garden — the zone comparison above tells you whether it will thrive.
Looking for plants that belong here? The Indiana growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Phacelia in Indiana
When can I plant Phacelia in Indiana?
Indiana's last spring frost clears between Apr 10 and May 10, and the first fall frost lands between Oct 1 and Oct 25 (NOAA Climate Normals 1991-2020). Phacelia is frost-tender — its listed minimum temperature is 52°F (USDA PLANTS Database) — so wait until the last frost has cleared your specific site before planting out.
Can Phacelia mature before first frost in Indiana?
Yes — Phacelia matures in 45 days (USDA PLANTS Database), and Indiana's dependable frost-free window runs 144 days (NOAA Climate Normals 1991-2020), leaving 99 days of margin. Plant just after last frost and it ripens ahead of the first fall frost.
What hardiness zone is Phacelia grown in across Indiana?
Indiana spans USDA hardiness zones 5b-6b (USDA ARS PHZM 2023). Phacelia carries a range of zones 2-11, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Indiana site have?
A typical Indiana site sees ~190 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Phacelia needs 100+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date. In cooler counties like St. Joseph, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Phacelia native to Indiana?
Phacelia is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in Indiana. It can still earn a place in a Indiana garden — the zone comparison above tells you whether it will thrive.
How should I amend the soil for Phacelia in Indiana?
Phacelia prefers pH 6.4-8.6 and well (dry spells) drainage (USDA PLANTS Database). That sits in the common-ground band across Indiana soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Phacelia actually grow on my specific land in Indiana?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores phacelia against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in Indiana
State-level data is a sketch. Your Growable Ground report scores phacelia against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Analysis by the Growable Ground research team, grounded in USDA PLANTS, USDA NRCS SSURGO, NOAA Climate Normals (1991-2020), and named Cooperative Extension sources. How we know →