Frost Dates for Plainfield, IN 46168
Last spring frost April 25 · First fall frost October 10 · 168 frost-free days · USDA Zone 6a
Frost probability for 46168
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 8 | April 25 | April 13 |
| Fall (first frost) | September 26 | October 10 | October 25 |
Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (34.2 km away); the 50% date is the median year.
Month by month in Plainfield
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start peppers and eggplant indoors 8–10 weeks before your last frost (around April 25). Start tomatoes about two weeks later, 6–8 weeks before last frost. |
| March | Start herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable. |
| April | Last frost around April 25. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings. |
| May | Frost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini. |
| June | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| July | Harvest regularly to encourage production. Monitor for pests and disease. |
| August | Midsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall. |
| September | First fall frost approaching (around October 10). Transplant fall brassicas. Sow spinach, arugula, and radishes. |
| October | First frost around October 10. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season. |
| November | Harvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year. |
| December | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
What grows in a 168-day season
Frequently Asked Questions
What is the last frost date for Plainfield, IN (ZIP 46168)?
The median last spring frost date for Plainfield, IN (ZIP code 46168) is around April 25. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area.
What is the first fall frost date in Plainfield, IN?
The median first fall frost date for Plainfield, IN is around October 10. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.
How long is the growing season in Plainfield, IN?
The frost-free growing season in Plainfield is about 168 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side.
What USDA hardiness zone is Plainfield, IN?
Based on frost date patterns, Plainfield falls approximately in 6a. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.
When should I start tomatoes indoors in Plainfield, IN?
Start tomato seeds indoors 6–8 weeks before your last frost date (around April 25). For Plainfield, that's roughly February 29 to March 14. Transplant outdoors 1–2 weeks after your last frost.
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