Frost Dates for Saginaw, MI 48609
Saginaw has 7 ZIP codes. The Saginaw, MI frost page lists all of them with their dates.
Last spring frost May 6 · First fall frost October 8 · 155 frost-free days · USDA Zone 6a
Frost probability for 48609
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 19 | May 6 | April 20 |
| Fall (first frost) | September 27 | October 8 | October 20 |
Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (42.0 km away); the 50% date is the median year.
Month by month in Saginaw
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start the slowest-growing crops indoors: onions, leeks, and celery (10–12 weeks before last frost). |
| March | Start peppers and eggplant indoors 8–10 weeks before your last frost (around May 6). Start tomatoes about two weeks later, 6–8 weeks before last frost. |
| April | Start herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable. |
| May | Last frost around May 6. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings. |
| June | Frost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini. |
| July | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| August | Harvest regularly to encourage production. Monitor for pests and disease. |
| September | First fall frost approaching (around October 8). Transplant fall brassicas. Sow spinach, arugula, and radishes. |
| October | First frost around October 8. 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 155-day season
Frequently Asked Questions
What is the last frost date for Saginaw, MI (ZIP 48609)?
The median last spring frost date for Saginaw, MI (ZIP code 48609) is around May 6. 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 Saginaw, MI?
The median first fall frost date for Saginaw, MI is around October 8. 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 Saginaw, MI?
The frost-free growing season in Saginaw is about 155 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 Saginaw, MI?
Based on frost date patterns, Saginaw 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 Saginaw, MI?
Start tomato seeds indoors 6–8 weeks before your last frost date (around May 6). For Saginaw, that's roughly March 11 to March 25. Transplant outdoors 1–2 weeks after your last frost.
Nearby and related
- Frost dates for Freeland, MI 48623 (9.4 mi)
- Frost dates for Saginaw, MI 48601 (9.7 mi)
- Frost dates for Bay City, MI 48706 (16 mi)
- Frost dates for Midland, MI 48640 (18.4 mi)
- Frost dates for Essexville, MI 48732 (21.5 mi)
- When to plant in Saginaw, MI: month-by-month guide
- When to plant in MI
- When to plant Peppers in MI
- When to plant Cucumbers in MI
- When to plant Zucchini in MI
- When to plant Butternut Squash in MI
- When to plant Basil in MI
- When to plant Sweet Corn in MI
- Look up another ZIP