Frost Dates for Cedar Rapids, IA 52401

Cedar Rapids has 6 ZIP codes. The Cedar Rapids, IA frost page lists all of them with their dates.

Last spring frost April 25 · First fall frost October 6 · 164 frost-free days · USDA Zone 5b

Frost probability for 52401

Frost10%50%90%
Spring (last frost)May 9April 25April 12
Fall (first frost)September 23October 6October 20

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (10.1 km away); the 50% date is the median year.

Month by month in Cedar Rapids

MonthWhat to do
JanuaryPlan your garden layout and order seeds. Research varieties suited to your frost dates.
FebruaryStart 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.
MarchStart herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable.
AprilLast frost around April 25. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
MayFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
JuneSuccession plant lettuce and greens. Keep beds weeded and watered consistently.
JulyHarvest regularly to encourage production. Monitor for pests and disease.
AugustMidsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall.
SeptemberFirst fall frost approaching (around October 6). Transplant fall brassicas. Sow spinach, arugula, and radishes.
OctoberFirst frost around October 6. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.
NovemberHarvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year.
DecemberClean up spent plants. Add compost to beds. Rest, review, and plan next year's garden.

What grows in a 164-day season

Frequently Asked Questions

What is the last frost date for Cedar Rapids, IA (ZIP 52401)?

The median last spring frost date for Cedar Rapids, IA (ZIP code 52401) 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 Cedar Rapids, IA?

The median first fall frost date for Cedar Rapids, IA is around October 6. 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 Cedar Rapids, IA?

The frost-free growing season in Cedar Rapids is about 164 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 Cedar Rapids, IA?

Based on frost date patterns, Cedar Rapids falls approximately in 5b. 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 Cedar Rapids, IA?

Start tomato seeds indoors 6–8 weeks before your last frost date (around April 25). For Cedar Rapids, that's roughly February 29 to March 14. Transplant outdoors 1–2 weeks after your last frost.

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